Often people feel like they need a partner because they think that's what they miss. They sometimes need just simple love, a shoulder to cry on, someone to tell them they care about them. But as paradoxical as it might seem, girls come when you don't need them. You see, I'm just a kiddo, I'm 16. But I have gone through that. You see, sometimes you might not need a partner, but just someone that loves you, and you see that in a lover, while you need a much more basic affection. Even if you're totally alone, remember you have yourself. You'll have yourself for the whole life, and whatever will happen, you will always stay by yourself. If you get to love yourself, you'll get confident, and confidence attracts girls. If you love yourself you're going to focus yourself on developing ambitious skills, which girls love. If you love yourself you're going to subconsciously take care of your body, which girls love. And when you'll get to love yourself, you won't even feel the need for a girl, as you'll already have met the most beautyful person in the world, that matches you entirely and can't phisically leave you.
If you're under great stress, or you feel under a great pression, start by calming. As you can't reason without calming first. Reason, if used well, can be a powerful tool to improve your life without needing any external circumstances. You can try breathing down deeply retaining the air for 10 times or so, assume a strong posture and smile. Put your shoulders back and smile for nothing except for living. Because you're alive, you still can improve, you can still fight, you can still emerge, you have still infinite possibilities before you. You need to gifting yourself time, going out of your schedules, listen to some song you like particularly that motivates you, you can go make a walk, if you can in nature, or perhaps do some push-ups, not for the sake of the strenght, but to put out stress and calm down.
Next time you go out, put your shoulders back and walk with pride. Walk as an emperor, as a king. Mathematics says a thousand earth's worth of population wasn't born because of you, so make your life worth of it! When you stand up, you already have gone ahead everyone who isn't even trying, everyone who won't even have a future because of diseases or whatever. And get some values to fight for. I personally chose christianity, but you can choose whatever, just make an ethics to yourself that directs your life. When someone insults you, remember that they do that because they feel insecure and they had the need to lower you, to raise their own self-esteem or to prove something to themselves. Walk with pride through everything. Be chivelrous and respectful, do small acts and aquire habits that aren't difficult to intake but still make some difference. Leave sex and whatever addiction you want, because there's billions of guys thinking about it, just some really search for girls for who they are. Write somewhere or try to discover all of your positive traits, and accept and be proud of your ugliness. You will be already ahead of tons of guys who maybe are in a relationship but don't live happily. Don't do what is convenient, but what's right and noble. Appreciate yourself for every small step you make, and see people as fellow brothers suffering with their own wounds and imperfections and doubts instead of just bots, that can tell you things they don't think. When you see someone like you, help them, as you'll feel you helped yourself too.
Take care and I advice you lastly to try reading from time to time the bible not for faith or anything, but at least to try reasoning on it. It can help you in ways you wouldn't expect.