I am an international student as well :) I am not the best person with grammar but here are some changes. Hope I helped you someway!
For a long time, Ithought my true goals were to be rich and have a great job, until I came to the realization that I needed things that are beyond the materialistic.
I have always lived in my home country with mysingle mother, who is a strong, selfless and supportive woman who felt the need to protect me asI was her only child, and while I am grateful for that, I felt the need to gain my independance andget out of my comfort zone.
this sentence is a bit too wordy in my opinion, try a different way!
I was hesitant about transfering to a university in USA because Iwasn't sure if Icould live alone and take full responsibility for myself.
If I think I can do this? I realized I was the only one who could answer this question , and now I am positive that I am making the right decision.
One more thing... I think the conslusion is too wordy- you only wrote one phrase. So, I think you should take a look and rewrite it.