Cute lol, other than maybe muscle training, i wonder how many guys go outta their way to look more 'masculine' but other than like facial hair (which is apparently looked down upon in Japan/pretty uncommon), i don't know how many ppl would look too diff as a teen, then again other than the pretty art style and long lashes i wouldn't consider him too 'feminine' versus it being a personality/attitude traits and such.
Tho apparently guys just have 'naturally' longer lashes, i remember
some girls complaining about that as a teen, although i think a lot of times the mascara looked a bit fake/heavy handed compared to fake eyelashes and even those were a bit much too
But hopefully he can get over his inferiority? complex. If anything, take advantage of it and get some freebies from the guys or so /pass off work to them tho i guess being 'manipulative' is an unlikable trait unless it's in a revenge story haha