From what I understand, most glider clubs are always looking for new members. Maintenance of the winch, gliders and landing strip is expensive and more members means sharing the costs. One in my province has "introduction days" where you can sit in a two-person glider, in front of an instructor, for a small price or even free.

I think you should just go for it - many gliding clubs have introductory or passenger flight options. I flew gliders for a few years and it's really wonderful - it's very quiet and the view is fantastic. Landing is suprisingly easy most of the time - when people fly "cross-country" (long distances, away from airfields) it's actually common procedure to "land out". Which is basically the same as an emergency landing (e.g. in a farmer's field) but much less stressful because gliders are actually designed to fly well without a functioning engine.

As others have said, go try it out with an experienced pilot/instructor! It's very accessible.

You might be more comfortable in a motor glider - they have enough thrust to conduct their own takeoff and get you out of trouble but are still light enough to glide effectively.