Do I have anxiety or is it a symptom of something more?

[Bubbleswonder]

I have really high anxiety. More than normal people to be exact. When I'm worried or stressed about simple things like college or homework I tend to get sick almost feeling extreme nausea. Here's where the extreme part comes in, it's not just that but when I do things like play games or get put in a new class with nobody I know or when I'm walking around huge groups of people. I try my best to keep it contained but inside I tend to feel uncomfortable. Here a few things a think I should note:
I have friends
I'm not sad
I constantly feel like I have a disease that I possibly don't  and that I could be suffering from it
I spend on average 15-20 hours in bed (I eat in bed because I don't like sitting downstairs, sleep, listen to music, watch movies. The point is I love being in bed and hate getting up)
I find it hard to go outside with my friends because I think about how that takes away from time that I have to stay home and lay in bed