By "caught" do you mean, by parents or by people you meet if you were to wear outside under normal clothing? I personally have had experience with both instances. Although I am currently fighting a very strong urge right now (after 2 years of not wearing) to wear again, I do realize your situation is similar to mine.
So here's my take on the parental situation. If you are afraid of parents finding out, I find that using diapers with a cloth-like cover helps to reduce the rustling and keep it even more discreet than with a plastic backed diaper. If that is not an option, you will have to pre-wet your plastic-backed diapers (a medium wetting should suffice) to make the rustling less noticeable. I probably got away with this because I had 50-60 year old parents, but anyway. One of the best ways to change undetected is to run the tap in the bathroom and turn on the exhaust fan while the door is closed and locked. That way there is too much white noise for the ear to catch behind closed doors. Just in case they might detect you changing, you could always undo the tapes slowly to decrease the sound of the tapes - especially the 3M adhesive tapes found on plastic-backed diapers. You can wet yourself in the same room as your parents without being detected as long as you don't make a scene or make any moves that would be suspicious to a parent. I would advise, however, against a BM in the same room unless you have stocked up on iron vitamin pills to lessen the smell. If you do BM in other rooms however, you can tell your parents you are going to the bathroom and change there. One of the best ways to keep your used diapers from stinking up your bathroom is to not only elect to do the trash on trash day (My trash days were biweekly, but yours may be different), but also make your "diaper day" trash day. When it is time to do the trash, you take the used diapers you throw in your bathroom can and put it in the center of the other trash bags you collected around the house. This will act as a stench insulator for pee and especially an insulator against leftover BM that is still contained in the diaper after flushing most of the BM. Take the whole bundle to the central trash can (mine is the kitchen can), bundle it up, and put it in the main bag for takeout. Finally your bathroom can should be underneath the bathroom sink (in the cupboard) or covered with something to prevent or at least slow down the smell of dirty diapers from permeating the bathroom. If any nosy parent wants to sneak a peak at an open can that has your soiled diapers in it, be sure to put some used tissues above your used diapers so that they are completely covered up and disguised.
While outside, Make sure you wear baggy clothing so to not attract attention to your diaper's bulge. If you want to be extra careful, you could put a solid color onezie on under your clothing to prevent sagging and preventing anyone from seeing your diaper as you bend over. Try to walk as normally as possible and focus on wearing diapers that are not very bulky or are meant for higher activity. You should take spare underwear/diapers depending if you want to change into another diaper or not. Do NOT BM without iron vitamin tablets unless you are within 2 minutes of a restroom as the smell from a BM will easily permeate a car or even an area around you while you walk. Be mindful of your diaper's capacity while outside and always remember to check when you have a chance to see if you need a change.
Just my :twocents:. Hope it helps!