I am very new to cycle clubs, DiDi, and I thoroughly recommend that you give it a go. Turning up for your first Sunday club ride can be a bit daunting if you don't know anyone, but after the first cafe stop you'll realise they are all decent friendly folk, and by your 2nd or 3rd ride you'll feel part of the furniture. The great thing about being a member of a club is that it sort-of forces you to put a regular ride in your diary, and you get encouraged into various suitable events (including socials if you want).
Oh, and don't worry about your abilities, if you were. There is only one rider in the club who has no-one slower than them, and one rider who has no-one faster than them, and they'll almost never meet. In other words, you'll soon end up riding with people at your level.