height doesn't matter. it's hard not to be dysphoric over it but the trick is to be confident and act like it doesn't bug you, because it shouldn't. i'm about 5'2", and i have no problems with people seeing me as a man. i also have a job that is physically demanding, and that is the ONLY time someone will comment on my height (and that's rare) because they think i can't lift or do things my coworkers can, but i do, and i do it just as easily which usually gets a surprised reaction which i find funny and boosts my ego because i proved them wrong. now that i've been on T i get judged as older a bit but still younger than my actual age but i have a baby face but i also have facial hair now (not much but enough to make me look older). you also should dress for the age you want. wearing baggy clothes, hoodies, track pants, etc. all of these things are things "younger" people would wear.
but i feel your pain where it seems like evryone is easily 6ft and you're just short. i'm in college, i'm going to be a paramedic and all the guys around me easily are 6 ft, maybe a bit shorter, but i just as easily keep up with them. i don't feel like i have all this extra work to do to gget to where they are because i'm just as capable and my height isn't an indicator of what i can or can not do. just be confident and dress your age and you should be alright.