My $0.02 so YMMV:
Diapers aren't so much a sexual thing for me as they are a 'comforting' thing... leading to less inhibition during sexual feelings. Since I have to perpetually worry about my leaking without, I enjoy wearing because I can put the 'always worried' to rest. The bigger the diaper the better (to an extent!) because that 'buys me more time'. I've had the same response to cathing too, but after a few blowouts (and tripping over my the tube to own bag!), I've gone back to diapers... I guess I'm a little klutzy. It may be hard but relax and the less you think about what others think, you'll be fine. If you think about it, would someone who's a typ I diabetic be embarrassed by seeing needles and insulin in their handbag/backpack? I mean, I'm sure there are, but I'd just be all like 'yeah, I need that to function normally, so I'm not the problem.' Like the old cliche 90% is half mental... well it's pretty true. Do what you need to do to be yourself and so long as you don't hurt anyone else, who is anyone to judge you... as a matter of fact, I'd judge them for being judgemental a--holes.