Like others, my suggestion would be to get stuck in and give it a go. If you try it and don't succeed, or decide it's not for you, then you've lost very little; if it works out, so much the better.
I tried with what was then the TA back in the late 1980s, was almost comically useless, but they let me stick around, taught me stuff, and pushed me to be less hopeless (and paid me, too) while I demonstrated that - I enjoyed it, learned a lot, and knocked off a lot of corners even if I was one of the world's worst weekend warriors.
A decade later I got nudged towards the Royal Navy Reserve, which (maybe arriving older and less unwise?) I found myself a good fit in, and I've been there so long I've got the PSOF medal.