wow. Dont be sad. I have had to learn that over the years. This is something that we all do for enjoyment. Mine is mostly sexual, but the urge to dress is still the urge to dress.
I too come from a positive family and am a retired professional athlete. I dread anyone in my family circle even remotely finding out. (not including my wife who knows, and has fun with it with me) I understand. You seem to be doing a fine job, but at that size, you must have a hard time finding sexy clothes that fit. lol.
I was in a very masculine sport, and secretly dressed for a very long time. At times it helped releive the pressure of big events. Of course I did not want to be found out, but what you do privately is your own affair. Good luck.