My girlfriend watch a lot of action movies, it bothers me that these action movies stars are there being watched by my girlfriend. They have big biceps and big pecs and abs while me! look at me, I have spagetti arms, boobs not pecs and flabs not abs... It's really bothering me.
Seriously Fuck youuuu Jason Statham!!! (damn body bro, no homo full jelly tho) and other action movie stars.
They have to work out in order to get that really ripped body so my suggestion is either understand that your girlfriend is with you, so she loves you and likes your physical appearance, or go to the gym.
Seriously? okay... there are hardgainers i understand, i don't gain easy as well... here's the thing, she might not be noticing these guys anyways... but in case you are concerned... ask her... let her know of your worries and insecurities...
and as a MAN, hit the gym, lift some iron.. I recommend Starting Strength or Strong Lifts 5x5, with the latter being completely free and easy.
Dont even think of doing curls or machines... compound exercises are best.
besides, a lot of those movie stars are juiced. look at bodybuilders from 1930... you'll see the difference.