Well, it's unfortunate, but a lot of people have very judgemental ideas about naturism. For one thing, they still call clubs, 'colonies', which is so outdated. Then they think it's full of pervs and not safe, when in fact, there's more people watching out for one another in that environment, than practically anywhere else. It's freer, better for your body (skin likes to breathe), and you meet ppl without airs and graces, and image.. Just them, as they are.
However, you will probably have to continue 'under the radar' since your parents seem to disapprove. There's a possibility you *could* say something like: well, I've done it for X number of months, and I'm still okay, but that might fall on deaf ears.
Btw, there's a really good supportive naturist forum called Cat's Chat you may be interested in joining. It's moderated, non-sexual, worldwide.