At 22 I'd say go for it. I did. I'm 40 now and still teaching / gigging / recording regularly. It's not an easy life though, and it helps if you have a support network around you, but be prepared to work very, very hard. You'll have some great gigs, and some where you feel like you're wasting your time, but even a bad gig is better than no gig.
Get regular exercise and eat well (as well as you can when you're playing away/on tour) though, it'll keep the energy levels up.
Good luck.