I very much feel for you and have a very similar situation. Bullied in school (to the point my mother pulled me out and homeschooled me for two years until I switched schools), and now have horrendously severe social anxiety, sometimes bordering on agoraphobia. I did finish high school, and went on to University. I made it through the first year, mostly because the one friend I had from high school was there and helped me through the first semester.
Anyway, people without social anxiety's experience won't be fully appic
At the start of the second semester he withdrew as his mother had cancer. I still managed to pass 4/5 of my classes, but pretty much became a withdrawn shut in, skipping many classes (out of anxiety, not laziness) and failing one of them because of it.
I took a year off, worked on my problems, thought I was ready to go back, but it turned out I was very wrong. With no friends, and no one I knew, at all there this time, I completely withdrew from everything, to the point of sleeping during the day and being awake at night because I was terrified of anyone seeing me. I started skipping all my classes, and lying to my parents about how things were going. Not because they wouldn't understand (my biological father suffered through similar problems), but because of my anxiety.
Anyway, after about 2 or 3 months or so of skipping school and lying, I eventually did withdraw and got half my money back.
So yeah, now I'm 22, C$30,000 in debt and don't plan on going back to school until at least 2011. :-/ Social anxiety sucks. (Although, the debt really isn't that bad, I have a good job with the army reserve, artillery, that pays well enough that I should be out of debt in 2 years. One of the few things I can do these days. :-/ )
I know this isn't an inspirational story with a happy ending (yet), but hopefully you don't withdraw as badly as I did. Unfortunately social anxiety is a terrible thing to try to get help for, as the whole thing is you're terrified to talk to (most) people.
Anyway, to answer your question, in most ways it's better than high school. Less bullying, less retards, less judgemental. In others it's worse. It's harder to make friends and you don't really talk to your classmates in class. I failed miserably because I didn't know anyone and didn't know how to get to know anyone. Without anyone to encourage me (or at least know of my existence), I gave in to my anxiety and skipped the schooling that I paid $15,000 (out of my own pocket) for. Blarg.
If you have any, try to go to university with a friend from high school. It helped me a lot in the first year, and it was only after he withdrew from school for personal reasons that I began failing miserably, having zero friends, and unable to make any.