How do you find your dream

I'm a 22m and just had ti withdraw from college again. I see these posts of people doing great things like chemistry and more because they have dreams and goals. My goal used to be the military and I did that. I am now in the reserves. But it's not enough, and I've been just existing for the most part besides personal issues that got resolved and trying to begin college. I need more now. I have a part time job which is ok, I really like the people I work with. I feel lost. How do I advance.