Let's take it with a grain of salt here. I mean, lets hope people are respectful at the parish and all - don't copy them if they're talking loudly, etc.
In the end, it doesn't matter if you're scandalizing them or if they're scandalizing you. Do what you've been taught, and if they don't like it, don't pay attention to them. Just don't degrade their practice either - there may be as much validity to it as yours. In an ideal situation, a person can go into a parish and prostrate or not prostrate without fear of reproach or whatever.
If the people are going to be totally put off by what you do, then do it in a corner where no one can see you. (You know, the whole "pray in secret, so that the Father who sees in secret...." - I know this is a bad paraphrase, but you get the point)