Should I stay or should I go

This is a question every one asks themselves many times in their life. Same to me. I made so many choices and ends up here -- south california, as an intern this summer. Eight weeks passed. I learned many things, technically and socially. I am happy about this, but the question comes to me closer and closer, Should I stay here after the August, or Should I go back to school?
This is a hard question. First, I do not know whether the company wants me to stay or not. Second, I feel so confused about what my life is going to be. I heard so many times during lunch with my supervisor and other workmates that many people in our company have more than tens of million of dollars. The CEO is a billionaire. ..... I am not sure how trustful is it. Whenever I saw those so-called multi-millionaire, their old and even ugly face, and ordinally-dressed up, I can not connect them with the richer. But I have no reason to believe that they are not. Thinking of the $20000 I might earn this whole 15-week summer, I feel so pity. Months ago, I was quite happy about getting such a well-paid intern position. However, comparing to those old engineers working under the same roof, I feel that there is such a big gap between us, not only age, but life. So what is so special about them and their experience that make them the multi-millionaire? Can I be as rich as them one day? Continuing staying here after the summer will make me richer than who I am yesterday, but I am working under the shallow of most others in the company because I do not have money to buy a lot of things they have. On the other hand, going back to school means I am back to that poor girl who can only save $300 per month.  I am asking Lord, should I stay or should I go.