I do understand this - I didn't have a career and was only beginning to get back to figuring out who I was (after a crappy relationship from college ended) when we had our son/got married (same year - I was 26, we started dating when I was 24).
So, I had a starting point, which was honestly more or less getting back in touch with "me" as a lil kid - music and art and environmentalism and all those things that were dear to me then. And experimenting, trying on hats. I have totally thrown myself into being a SAHM, but I think becoming a mother has strengthened me and helped me figure out who I am, what I value, etc. Building a family and deciding how you want to raise your kids, your collective values, what you eat, wear, do and buy - all of these things and more - are a huge creative exercise! Every single day.
So aside from kids, I would give yourself time to check out random books at the library on topics of interest, or try out a new author. Occasionally indulge in things you loved pre-kid (perhaps in a more kid-friendly way - once in a while I escape to the bookstore alone for an hour, to browse and drink coffee in peace - but more often, I take DS with me - not the same, but it helps!). Likewise, doing yoga with kids climbing on you is different, but it helps. Find some cool things going on in your area if you can - festivals, music, art, museums, movies - anything cultural that strikes a chord or you think could be interesting - and try to go or bring the family.
What did you like to do in your alone time, before you met DH? What are you doing when you close your eyes and go to your happy place amidst the day-to-day family chaos? Give yourself permission to try out lil things that make you happy or curious or whatever. They may prove to be a lasting interest or move you on to something else - in any case, I think you'll feel more like an interesting adult with depth beyond the mom role (but absolutely respect the time and energy and part of you that is in that role!).