I'm kind of at this point in my life, too. Been working for a few years at a good job that pays decentley, but I'm incredibly bored. For reference, I'm a library technician at a legislative library. It pays well, it's government, so I have great benefits and such, but it's boring. Walk in and check-out boring. I'm supposed to be working right now.
I used to work in schools and really enjoyed it when I was with the kids, but most of the work is shelving and checking books in an out. I did teach, one year, but that was at a private school and technically I wasn't supposed to teach since I don't have a teaching degree. But I did it and I loved it, aside from the politics and parents.
I did a practicum at a small town public library and fell in love with the life. It was amazing. I keep looking for work in small towns, but it's non-existant. It also pays pretty poorly. However, all I've wanted for most of my adult life is to live in a small town and have a little shop/run a small library. So I keep looking.
I'm stuck throwing my brain into the jar as in the comic, but I have hope. It's bearable because I get a lot of vacation (15 days paid, 20 days unpaid a year, will increase the longer I'm here) and the house I live in is good, but it's not what I want to do.
Now that I"m almost 30, I want to go back in time and slap my early-20's self and say "WRITE! Just keep writing! Travel! DO SOMETHING!", but I can't. So... there's a large chance in the next year or two that I may leave my job and just go do what I've always wanted to, leaving meagerly on my savings and other income I can find.
Do what you love, but finish school first, so you'll always have a backup. Keep the skills fresh, but, christ, you're young... do what you love first.