*Stops to Google solipsism*
Are you taking philosophy classes in college? I think this is a known side effect of that.
I had some similar anxiety when I was your age, and this cartoon made an impact on me:
The point is that you can't think about big things all the time, and it's important to "revel in the mundane" as I put it. Watch corny sitcoms, engage in a hobby, enjoy simple things in your life. If you think too much about the big stuff, you'll lose your balance on that perch on top of the chimney.