What should I look out for if I have a feeling a girl likes me, like what are some signs

Thanks for the advice

HI I am new to this so I want some advice, I'm having problems with getting into a relationship, I am a guy and I've never seem to get girls attention all though I am told I am a nice sweet guy...could it be girls aren't romantically attracted to me because I am fat? If anyone has ideas or clues to ...