Hey there
My friend, it sounds like you've really hit rock bottom, I'm just going to be blunt. However, the good thing about that is, there's no way but up from here. You can change what you're going through, I promise you this. A good point I see is that you chose to come here for help; that means you're not totally enthralled with taking your life. This is a very positive thing. You came to a good place, because there's an entire team of people on here that dedicate a little chunk of their time to helping people. Sorry we weren't able to answer you sooner though, our numbers are a few at the moment.
First of all, you really need to focus on school at this point. I can't emphasize this enough. Why? You said about wanting, needing to get out of your house when you turn 18. I can tell you it's very hard to do that without an education and that diploma. Getting a GED just isn't the same thing these days. People look for that diploma. I know how hard it can be to go to school depressed and try to get good grades, because I've gone through it myself. It's a bitch to be perfectly honest. You have to make it through that struggle though and shine. At the very least graduate, you don't have to be valedictorian. You just need that piece of paper.
Also, you say about people not liking you, but this is also something that you really can change. I used to be unlikeable and weird a few years back, but I got to the point where I'm very sociable and friendly. That's all it really takes to make friends, is to be friendly. I've also found that taking up new hobbies helps because then you can have something that you can relate to people with. Or, something to do when you decide to hang out. The possibilities are endless, and I know it can be hard to grasp on to these possibilities when you're depressed. It puts a damper on everything that you want to do by making it a hundred times more difficult for you.
I know what depression is like, and I know what rock bottom is like as well. I'm a survivor though, and you can be too. It's hard, yes, extremely hard, but you can fight this.