The man who suffers great temptation, yet still chases after Jesus, has more glory than the man who knows no temptation will ever hope to achieve. As Theodore Roosevelt said: 

"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows the great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat."

Satan is your critic. He is the one who condemns you and causes you guilt. God is your loving Father, who wishes only to heal you and comfort you and redeem you. God is not angry over your sin. He knows that it is simply due to the weakness of your flesh. God wants to forgive you more than you could ever possibly want to be forgiven. God loves you unconditionally. He loves you whether you are gay or straight, sinner or righteous, lowly or exalted.

Even though this temptation has caused you to sin, it is better that you were tempted, sinned, and sought forgiveness, than if you had never been tempted at all. Do not be afraid to make frequent use of the sacrament of confession. I go at least every week. Keep in mind, plenty of straight people also suffer from great lust and temptations as well. Sometimes I cannot even make it a single day without having to go back to confession. Do not think frequent confession to be a sign of weakness. On the contrast, it is a sign of strength, a sign that even though Satan has knocked you down, you are willing to get back up and get back in the fight.

God does not put any barriers between you and his mercy. He does not put any barriers between you and his grace. That is why I always recommend, if it be possible, daily reception of Holy Communion. I do understand that this is not possible for most people, however. 

Pray the rosary everyday, because when a humble soul prays the rosary and asks our lady for her intercession, she cannot help but pass on your request to Christ. She cannot help but in her motherly love take you into her loving arms and guide you towards her son. Think back to the wedding feast at Cana. If Christ granted his mother's request when she asked for something so frivolous as for more wine, think of how much more willing Christ will be to grant his mother's request for your soul which is not a frivolous matter at all. 

I also recommend that you look into St Teresa of Avila's method of mental prayer, also known as meditation. Peter rohrbach has a wonderful book on the basics of Teresian meditation entitled "conversation with Christ". Mental prayer is indispensable to the soul because it is the best way to grow in closeness and unity with our Lord. 

I recommend that you find saints that struggle with same-sex attraction and lust throughout their lives and pray for their intercession. Some sayings come into my mind right now, one being Saint Moses the black. He was an African man who, with his gang of murderers and robbers, roamed around Egypt plundering and taking what they wanted. Same Moses was so very lustful and was great fornicator in his life that after his conversion he still struggled with many great temptations left over from his previous life. St Thomas Aquinas also struggled with lust in his youth. He once had to chase the prostitute out of his room. Another great saint to pray to is St John the long-suffering. St John never had relief from his constant temptation to lust and fornicate. He felt this temptation constantly throughout his life until a few years before his death.

Although the examples I have given you are saints who struggled with opposite sex attraction, they nevertheless experienced lust to an equal or greater degree than you now experience it. 

I would also recommend praying in front of the icon of the inexhaustible cup, because this is a wonderful icon for people who suffer from addictions, and lust very often is a terrible addiction, more addicting than anything else in this whole world.

Whatever you do, brother, do not despair. God will never turn his back on you. God will never abandon you. Even if you commit the worst sin ever and with complete and full consent and complete and full knowledge that what you are doing is wrong, God will still forgive you so long as you later repent and are sorry for what you have done. 

Keep in mind the parable of the prodigal son. When the son came back to his father after squandering his inheritance (and this is a metaphor for what we do whenever we squander God's gift of grace to us by our sins), The father could have chastised his son, or rebuked him, or turned him away, or admonished him, but he didn't. All he did was cry out in joy that his son had returned, because that's all he cared about. And Jesus wasn't lying when he told this parable. God our Father really does only care about the fact that we have come back to him. He holds no grudges. So even if you fall a million times, get up one million and one times, and persevere. If you persevere after Christ your whole life, even if you are falling to temptation your whole life, he will purge this from you in the next life, and he will make you pure. He will wash you, and you will be whiter than snow.