(((Arethausa)))
It sounds like you've grown a bit, and you are now feeling a bit frustrated with the path that you were on before. Maybe your bf is looking at life differently than you, and doesn't have quite the same plans.
Honestly, no, I wouldn't refer to what you've described as midlife crisis. You are still so young. I personally believe that midlife crisis doesn't necessarily strike us when we are around 40.... but I do believe that midlife crisis consists of huge emotional, financial and often physical problems occurring during these times in our lives. As we get older, our lives very often become rather complicated.
During the midlife period, we are more aware of how quickly our parents are approaching their later years... we see how quickly time flies, and can easily name many that we cared about who have already passed away. It's complex ~ lots of levels.
Please don't think that I am minimizing your experience. I am not trying to do that at all. I am very sorry that you have been struggling so much with the decision that you made over one year ago. Have you talked with anyone in
your world about how you've been feeling about the decision that you made & your difficulty in seeing other babies since that occurred? Like family, friends, a therapist,...? I think that linking up with another woman or two, like yourself (who are wanting to work towards their goals), could be very helpful. Women need to hold onto their friends ~ whether in a romantic relationship or not. We often tend to lose our friendships, while men rarely ever do. A common result of this is sort of losing "ourselves" in the romance.
Go back to school, if that's what you want to do.
Make some friends of your own.
Follow your dreams with a little bit of reality thrown in, to keep you out of la-la land.

Enjoy your triumphs, and reward yourself.
Learn from your mistakes..but don't kick yourself down. Just remind yourself to apply this knowledge in the future.
I think that it's great that you've already gotten some of your education credits out of the way! That makes the path to ______ that much shorter.
I was around your age when I finally decided to go to college. I never regretted waiting until then to go either ~ as the many that I saw coming straight from high school weren't emotionally committed to learning. In my opinion, I think that it is best to wait until one is ready & wants to be there. Because that is when people do great in school! That's when we excel and we enjoy learning. Those were some of the very best years that I've had so far in my life. Honestly!
Best wishes to you ~ take care!