If your heart isn't in nursing then you should put it on the back burner for the time being. The time spent in school will demand a great deal of dedication from you and there will be times that you want to throw in the towel due to exhaustion, frustration, etc. If your heart isn't in it you likely won't stick it out through the rough times and you could end up dropping the program and having spent all that money without anything to show for it.
There's not a darn thing wrong with being a CMA. I am and I'm very proud of the education I've had and of the work that I do. If you are excited about being a MA/Phlebotomist, then follow your heart and go for it! If you want to become a nurse later you can always go back to school at another time and follow that path. Who knows? Your employer may even give tuition assistance depending upon where you work.
I know this is a nursing forum, but this section IS for CNAs and CMAs, therefore I can say here that being a nurse isn't the be all/end all. Medical Assisting is a very rewarding career choice. And salaries vary depending upon where you live and upon the facility. I live in a pretty economically depressed area of the country, yet there are still PLENTY of MA positions out there and I've been offered everything from $8.00 per hour (uh, no) to $16.00 with full benefits (including laundry service for my scrubs
and a uniform allowance!). Just accept the good job, turn down the others.
Good luck to you. Follow your passion!