I am a guy shy of being shirtless at home in front of my family?

Hi everyone. I'm 18 years old guy and shy of being shirtless in front of my family. I'm not fat, too skinny etc. but I can't take my shirt off and walk around at home because of my mum and dad. Of course it's winter now but in hot days i've never taken off my shirt and slept like this. I even get shy when I watch a movie with my mum and shirtless man appear there especially muscular man. What's my problem and how can I go shirtless?
Thanks.
I am a guy shy of being shirtless at home in front of my family?
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