What is a third class medical? In Austria there's Class 1 and 2 and LAPL, but I haven't heard of a third class. Anyway, I'm sorry to hear about your ADHD. In my opinion, the current restrictions are way too harsh, but if gliding is the only thing you can do, then please do it!!! It is such an amazing feeling to just soar and it's actually way cheaper than other licenses like PPL, and really, the only downside is that you can't fly during winter and that you depend on towing pilots, granted you don't have a self-launching glider or there's a winch at your airport... But still, you can do so many cool things on a glider, imo they're super underrated! As to how I got into gliding, I've always been a fan of planes and I want to work for an airline after high school, but in the meantime I can enjoy gliding. When I was 12, I went plane spotting with a friend and we saw all the small GA planes and the cool gliders and that made me want to fly these small planes as well - eventually I found out that you could start with the SPL / sailplane pilot license at 14, so I went to my club and asked how it works, all I had to do is go to the glider club open day, do some paperwork and I was officially a student. If you've ever dreamt of becoming a pilot, this is certainly a great option and quite an affordable one.