I feel that way, currently.
I'm currently working at a local McDonald's; if you put the hours in, the pay is decent. It's also a pretty fun work environment and the teamwork is great, but it can become slightly stressful during the busier periods. My grades this year were nowhere near the requirements for the university I wanted to attend (Lancaster), so I will be resitting some exams.
University is not the only option, though some TSR posters like to allude that it is.
You could take a gap year or two; there are so many possibilities for you during that period of time, whether it's work, travel, volunteering, etc. Just overall bettering yourself, your skills and your experiences... and being happy.
You don't have to go to university at all. You could discover more regarding what subject/degree you're most interested in over the course of a few years, whilst earning money/working in the community/etc.
I think what matters most is that you actually
do something, rather than playing video games day in, day out, for a year.
Personally, I don't think there is any subject that I'm passionate about enough to study for another 3/4 years. Hence the burger-flipping
I also regularly go out walking/hiking, though as winter sets in, I'll have to find an alternative hobby.
My parents are a little disappointed, I think, but I don't let it affect me.