I'm a PT and I love my job. But as Knott says it is not easy and how happy you are depends a lot on who you work with. I'm lucky enough to work for people who are truly motivated to help and are not into the money grab.
When I was an undergrad I had a very promising path ahead of me as a molecular geneticist. I had a premier researcher take me under his wing and it looked like this would be my life. I was on track to go to grad school at MIT.
In highschool I had always entertained the idea of being a PT but circumstances were such that I ended up in sciences instead, at first anyway. The researcher I spoke of unknowingly sealed the deal for me. he gave me a vey well paying (for a student) job in his lab for the summer. I helped him with ground breaking research. I counted bacteria, washed flasks and set agar all day. I didn't talk to a soul for hours at a time and I went crazy. I decided I needed a much more social career and went back to PT. Never regretted it.
So now I make a modest living but I love my job. To reiterate what others have said, life is way to short.
I think Knott's advice is good. Work as a tech for awhile before you commit to tuition etc. It's not a decision to take lightly but it sounds like you need some sort of change.
Living life like there's no tomorrow.
http://gorgebikefitter.com/
2007 Look Dura Ace
2010 Custom Tonic cross with discs, SRAM
2012 Moots YBB 2 x 10 Shimano XTR
2014 Soma B-Side SS