I think everyone is afraid of being alone.

However when your in your 20s and in a serious relationship you need to make sure you grow together. It sounds like she made life choices that deviated from yours. Get out now before your married to her. I had a friend who converted and they broke up because they werent compatible anymore.

If you had one girlfriend I am sure you can find another. This may be a good time to work on yourself/your career/school/build and renew friendships.

Dont stick it out unless your willing to try Christianity.