Why am I afraid?

Why is it that I have no problem taking care of my life when I am alone but when my family is around I tend to limit myself? Let me explain. For those who don't know Tom, he is a godly, caring, generous man, husband and father. My kids are great. But like many families we do our fair share of picking on and teasing each other. My weak spots are cooking, running and general housework (to name a few). Those are fair game when they are around. However, what I have recently realized is that I do many of those things (not the running) when I am by myself. Thursday nights Tom has commitments at church and what do I do, but go to the gym. I took Friday as vacation day and cleaned the linen closet, bathroom (including floor), reorganized my dresser, matched and tossed orphan socks, cleaned the kitchen, made myself eggs for breakfast, grocery shopped and went to the gym. I didn't even think about it I just did it.
I was trying to figure out when I was going to the gym this weekend and do some general housework. I wasn't sure when I would do that 'stuff'. Tom told me he was going into work on Saturday. Bingo! He left by 7am and since I was awake, I got up (bummer on a Saturday). I cleaned up the kitchen, went to the gym and made myself lunch. I made a hamburger (using the stove is not my specialty) and reheated some veggie soup we made last weekend. Normally I just wait until he comes up with a lunch idea and then he makes it. Yes, he does 90% of the cooking. Yes, I know I am spoiled (he also does the laundry and I fold).
So why don't I do these simple yet helpful things when other people are home? Am I afraid of being judged or laughed at? Probably. I know that is silly but that is how I feel so it isn't so silly. Is it?

+12 day    
-5 weight (I think twice a week would be wise -Thursday and Sunday)