Uni is a fab thing to go to, you make friends for life, have a ball and learn new skills. I was 19 when I went, I would just go for it, cos if you leave it and get to my age of 31 you may have different priorities and may not be able to go.
You'll have the time of your life it's the best thing I ever did (well the course was very boring at times, as was the homework, assignments - but we had lots of fun and adventures) in fact I met my old flat mates of 12 years yesterday, we all have kids now it is great they all play together!xx go for it. x