Gangster Bro, I know exactly how you are feeling. It's scary how similar our thoughts are (well, for me it was how I felt a couple of years ago). Trust me bro, things will get better. That doesn't mean that you will get everything that you dreamt of as a child, that just means that you will learn to be complacent and start appreciating what you have. As bad as you situation is, you still have enough to eat, a place to sleep and access to a computer. What % of the world's population do you think has those things? The most important thing for you is to stop regretting and thinking of what life would have been if you had done things differently (like not coming to the US). What's done is done, be proud of the decisions you have made and the lessons you have learnt. Also, stop comparing your life with others (eg Americans). Focus on your life, don't compare your life with others. And most importantly, start exercising for at least a few minutes everyday. That will help relieve a lot of stress.

Take this from someone who a couple of years ago felt exactly the way you are feeling right now--- things will change for the better. Please stop focusing on the past and how things could/would have been. Think of the future and how you can improve it. As bad as things seem right now, things will change. Just hang in there, bro. It's just life. No big deal. Remember that everyone feels this way at a time or other. Just hang in there.