I'm 23, I've been to four different schools. I recently just took a leap of faith and went back to school full time for mechanical engineering.
I just want to say that I am finding it very rewarding.
So if you are thinking about going back to school, for anything... doesn't matter what it is. If you feel like you are ready to do it, I say bite the bullet and do it. Education is a gift that we are so blessed to have access to. In the last 2 weeks I have learned so much, I can only imagine how different my life will be 4 years from now.
Never take no for an answer, and be confident in your abilities. Embrace that you don't know everything, and be willing to look for help. Fail fast when failing is cheap.
That is all, carry on.

