Hi there my friend.

Good to see you posting. I am sorry you are hurting though. ❤
I am going to break apart your post and then add my commentary.

I can't do like everybody else; how hard is it for people to understand?

You may not be able to do everything like everyone else, and that's ok. It means you have things that make you unique. We all need to be unique in some ways. Those unique things cause us to develop other uniquenesses about us which in turn is what helps develops us as individuals.

No matter what you believe you can and cannot do, you are a good person. You care. You cared enough to reach out to me last night even when you thought you didn't do a good job (you did ❤) Thank you.

I'm not strong. I can't just suck it up.
It's ok to not be strong all the time. Go ahead and cry. Scream. Punch the pillow cases. Throw things (not at people). Blare that music loud. Stomp your feet. Slam the doors. Do what you need to do. Get it out. Just don't hurt others or yourself.

I'm not smart because I have a diminished IQ as an adult because of all of the living hell I've had to deal with growing up.
IQ isn't everything. You articulate very well. You know how to build pc's - that's a skill I don't have. You can help others if you so choose - even tho you dont think you're good at it, you are. Life isn't all about IQ - and as much as people will tell you differently, not all jobs are either.

All I am is cunning. I am brilliant when I'm in a position to where I can lie or cheat my way into something but I'm utterly worthless and powerless otherwise.
How does one lie or cheat to create a PC? Let me know please and hell, I may actually consider it myself and I'm a pretty honest person! I don't think you can lie or cheat to create something though - you either create it or you don't.
You are my friend. I don't consider my friends to be worthless. You are a very kind and caring person or I would not associate myself with you as my friend. ❤

So if I can't lie or cheat, how the hell am I supposed to do anything right? I can't do like everybody else anyways. I don't have the knowledge or experience that other people 5-8 years younger than me have. I can't prove myself to people so why do I bother?

You bother because you are a good person at heart doing the best you can to get out of the crap that was once your life. If you do not like something about yourself now - change it, don't let it eat you up. You don't have to be the same person forever. Life is about change. ❤

I'm nothing. I hate myself. I wish somebody would kill me because I'm too much of a coward to perform the deed myself.
I understand completely how this feels but consider it carefully. Think of how many people on here alone (myself included) you have influenced in a positive way. Therefore - you cannot be nothing. Positive energy doesn't come from "nowhere". We all hate ourselves from time to time but those are the times to do a self analysis. What exactly do we hate about ourselves? Dont just say "everything". Really look at it. What is it? Is it your hair? How often you do or dont shower? Your temper? Your scholastic achievements? Your sense of humor or lack thereof? etc... analyze it out. Decide what exactly it is. Then decide what you would like those things to be.
Example:
I hate that I tend to snap at people too quickly and then I cant make friends.
I want to be able to be more relaxed so I can be friendly.

Then you make a plan to work toward that goal.
Example:
From now on, when I feel like snapping, I will smile and make a funny joke instead.

Then you follow through on it.

I hate life.
I think this is something all of us here have said at least once. You are not alone. The best we can do though is make the most of it - in the good and the bad times.
Remember what I always say:
The past cannot be changed, why worry on it (more than you have to)?
The future is not guaranteed (who is to say you will be here even five minutes from now?)
The present is what matters, you can change your forever with this very moment (you can be as happy as you want, as sad as you want, as angry as you want, make a life changing event or even a world changing event)
Focus on this moment