I’m a “young adult”, according to the US bishops (ages 18-36), and there are young adult groups at my parish and at several of the nearby parishes (and, actually, all throughout our archdiocese). We play soccer every Monday, and the other group goes camping, rock climbing, etc. I’d say that we’re pretty active.
So maybe it just depends on where you are. Am I correct in assuming you’re a “young adult,” too? If you don’t have such a group, then you could start one–then invite people in the group to do some of the things that you like.
Anyway, I can’t imagine why a girl being active would turn a guy off. But then again, maybe that’s because I’m active myself? I think it’s just a matter of personality. I would think, though, that **some **kind of activity would be encouraged among orthodox Catholics, if for the simple reason that we have a moral obligation (rooted in natural law, in the 5th commandment, and in the commandment to love our neighbor as ourselves) to take care of our bodies. It is a part of being a good steward of the “talents” that God has given us, understood, of course, in the hierarchy of values–that the soul is more important than the body.
I don’t know if this helps. Ask the Blessed Virgin Mary to send you the guy for you, and she will do it (assuming God is calling you to marriage)! Don’t stop praying for this until you’re married!