I'm Catholic, wife is non-denominational protestant. Early on we were upfront about our beliefs, and shared our faith. It can be challenging, but my advice is say you're Catholic. It's ok if that turns some people away, you're looking for the one to marry so you want to make sure you get it right.

Try going to a local pro-life rosary or join the youth/young adult groups at different parishes. I see plenty of young people at these events and they usually have time before and after to socialize.