Can you check my sentens whether it is right or not~?
 

-> Can you check my sentences whether it is right or wrong ?

I know I look younger than my age and I am more handsome than he.

--> I know I look younger than my age and I'm more handsome than him.

but if I tell my friends this like thing. they might tell me "who says" and I might be

-> but if I tell my friends about this, they might tell me " who says" and I might be

beaten by them.

-> beaten by them