I don’t see this as being about teenage girls or women your own age. It seems that your lacking a balance between living in the present and the past. The past often looks better or worse to us than it did originally. I think being in your twenties and somehow idealizing your teens and that of others can be pretty common.

The thing is your ex girlfriend was just one girl. She does not represent all teenaged girls or twenty something women. I think this issue has a lot to do with getting over a first love/heartbreak. I’m not sure everyone gets over that person but attaching yourself to teenaged girls in your twenties. Don’t be that guy. It will just lead to you having even more stuff to worry about down the road.

You can’t redo your youth by seeking out someone living theirs. Find a hobby, coworker or classmate who’s an adult female and learn to just relate women as people who you could see as friend. You have to see if your mind can be programmed to see twenty something women in a different light.

Good Luck