Please need advice

Am just in my early 20’s Currently dating a guy much older than me (18) yrs older than me .I don’t love him he is totally the opposite of what I like in a man depending on his appearance I know you would ask why I agree to date and live with him ?, it’s because I didn’t have where to stay and he loves me he takes good care of me but personally I feel embarrassed with him in public because he is soo much taller than , older ,has kids ,we don’t match at all because I look way younger than him .So please how can I tell this guy that I don’t love him ? Because I don’t want to hurt his feelings but I feel I can’t pretend or push this relationship any longer .Am so depressed