No offense to XdarkblueX at all but God is not the answer for everyone. If religion is something you have in your life, that's great and it can help but it's not there for everyone. I went through the same thing for around five years, starting when I was only 11. When I looked at my life, it wasn't even a terrible life, which made me feel worse for being so selfish. There are so many people with worse problems than my own and I felt pathetic thinking that I couldn't live through mine. I don't know if I made the healthy choice by relying on new friends to make me feel better but I can say that they kept me alive. If your friends help, surround yourself with those people. It is important to rely on yourself to be happy though, which I'm still learning to do. I know it's hard to imagine a different way of feeling because depression is like having your head in a raincloud but it can pass if you try to help yourself. Talk to people, don't keep it in. I found that St. John's Wort helped a bit. It's a natural anti-depressant so you don't need a prescription for it. Also, I know that there are a lot of different types of fathers out there but maybe if you told yours how his drinking was affecting you, the two of you could help each other. Don't act on your thoughts or dreams. I promise you, it's not the answer. Suicide can be like a poison to those around you. You can make it through it. Sometimes it just takes time. I'm always here to talk if you need to. Sometimes talking to a stranger can be easier.
"God doesn't give you anything you can't handle" and I know it may seem cruel. (Why did God give me this life?) But when that thought occurs remember that he suffered more than you did just because he loved you. Love can do many things, even keep you alive.
I don't know about your beliefs but try going to God when you feel like you have nothing left, even if you don't think he's real at least his idea is something that you can always turn to, someone who will never let you down. Someone who loves you no matter what.
You can't focus only on the bad things in your life. Think really hard about all the things and people you love, the things that make you happy and the things and people you couldn't live with out; it all weighs more. It's worth it to end your life over problems that can eventually be solved even if now you don't see it that way.
Lifes just a game, it will be what you make it. If you think your dad drinks too much, try getting him some help. Talk to someone close about the way you feel, opening up can make you feel a whole lot better.
I'm glad you've been spending time with your friends but nothing is worth ending your life over. I'm here to talk to if you ever need someone. I can also give you some numbers for hotlines you can call.