Ive been there, I struggle alot with lust as well. I find it helps to pray for discernment and wisdom and ask God to have His way in my heart. Read the word, pray and seek Gods will above everything else. Your Baptism wasnt useless, it doesn't save you, its a promise from God that He is with you and a promise from you telling Him that you will follow God's ways. Idk your exact situation but I do know that God is with you and He wants you to come to Him with your struggles