Hello there. You have plenty options to do. Here's some examples:
1. You may have fun without OC at all. You will create one as soon as you'll get the idea of new OC. Don't push yourself.
2. You do not have to limit yourself with a single character. Several of them can represent different aspects of your life. You always may add more and drop ones who do not fit anymore.
3. You may even generate physical characteristics of new character flipping a coin (no one of us choosing who to be born, actually) and then decide what your new character would wish to do living in Equestria.
P.S. Also, it's cool, that your mother is related to the fandom. Cheers!