In early transition I definitely felt a bit uncomfortable with being called a man; boy or guy were fine - they fit. I basically felt stuck because I did not go through the right puberty, until that started to happen - my biological clock felt frozen. I couldn't advance in life because I didn't want to start anything before I could start it in the correct gender - college, jobs, relationships, etc.
I'm now 6 years into social transition, 1 and a half years on T - couple of days post op - and I still wouldn't say I feel like a man

I'm almost there but not quite, I feel on the verge of late teenager/full on grown up

even though I'm almost 25 I am in my first year of uni with a bunch of 19/20 year olds.
Luckily, trans guys often look younger than they actually are so it allows this sort of catching up to happen