Stop drinking. Stop fornicating. Try to pray. Try to attend Church, any of them. Whatever circle of friends you have, now is the time to slowly fade from them. It will be hard and lonely, I'm not sure what your family is like, but if they arent Christian it will be even harder and lonelier.
You are never beyond redemption, so long as you repent and pray. That is not a meaningless platitude. How truly awful and miserable you feel, no matter how much you want to believe that will never make you irredeemable. God still loves you, and He will always love you, and He will always bear the weight of your sins so long as you give them up. Always remember that Judas dammed himself through despair, and not through his treachery and killing of Christ Himself. To suffer for Christ is to be a Christian and you are never alone brother, so be glad that you are being tested with all of us.
You're young still. I can't know what it is that tripped you, but the lesson you should learn from it is to always have a plan b, c, and d and make preparations for each accordingly. It sounds like you live with bad friends who led you down this bad path. If your parents are good Christians, beg and plea to go back. If they aren't, start looking into better living situations. Whatever form that may be. If that means living alone, then that is your new mid-to-long term goal. As for your friends, I don't think there is anything you can really say to change their minds. You are human and prone to error, minimize your time around them, but if they come to you in need be there for them. By doing can you ever convince someone. Unless it is actively harming you, it doesn't matter if they are abusing your kindness.
You walked yourself deeper into hell, but through Christ can you crawl out. Simply doing nothing is an improvement over sinning. Delete your porn folder, pour out your alcohol and change focus any time you are tempted. If someone is tempting you, get away from them. If you can't, dont get angry with them, but just passively and calmly reject it. That is the hardest type of resisting but it is what it is. Avoid flirtation. Go out and get some healthy hobbies, get away from the internet altogether. The sun is good for you and will help you think clearly and the hobby will distract you from the sin in a productive manner. I myself am guilty of failing at ALL of this, and I am working my way back up again. You are never alone.
As for the homosexuality, that is between you and God. Some struggle so greatly they must confess it and deal with it that way. I cannot know what you struggle with, but I too struggle with intrusive thoughts of every variety. I struggle to look other men in the eye at times because there is a voice that always tempts me. In my case, it seems more like tourettes than a long burning passion. Nonetheless, whenever I am tempted I don't dig in and reject it. I accept that I am being tempted, that I want in a way to sin. I pray the Jesus prayer ("Lord Jesus Christ, Son of God, have mercy on me, a sinner") with heart, and turn my mind away from the thought itself. Sin is very casual and quiet. The best way to resist is by being meek and passive. It is like an insidious firebrand, a sociopathic manipulator. It will come to you as a friend, relaxed and enjoyable. But the moment you take any stance, instantly everything you say is wrong and he is right and there is nothing you can say that will ever prove him wrong. So instead of taking a stand and falling into worse sins, just as casually and quietly as he approached you should you casually and quietly walk away. If you give sin neither ammo nor target, it will just shoot itself.
God bless you anon, and always remember God is with you and begome Orthodogs.