I think alot of our hangups and insecurities come from the idea that nothing really changes and that our body's don't fit in to the norm so if people saw what we see they will be a bit taken back or judging. And i just don't think that's the case anymore now days. I think a lot of people got too much of their own s--- to worry about to care, and if they do care, thanks to social media the average attn span doesn't exist long enough to keep in mind once they pass you by.
I think also many men who develop breasts whether they are noticeable or not, become self conscious especially if they reach a point where a bra isn't just something of an option but more of demand and necessity for comfort, that what will people think. And to me, I just learned to quit caring myself because for myself, I just had a reality check of realizing I'm just a regular guy...who has perhaps an irregular chest...and that's alright. When I am in the gym I see muscles and 4 day old beard and when I talk, act, behave, etc etc..I hear, see and do guy things. I'm not trying to be something I'm not. I think just rolling with the flow also helps. If someone ever asked me about my chest or bra lines, I'd tell them without showing shame...if someone joked, i'd laugh with them.
I think lastly that this forum has served a tremendous purpose for me and others alike. I know for me at least, if my breasts grow any more I am going to be a confirmed c cup. I already teeter on the fence of b and c depending on the bra, and while I workout a lot and have lost about 15lbs since summer, my chest hasn't really done anything. When I was barely an A cup i was shopping around for surgeons...found this forum and it gave me peace to talk to guys like me...as they grew in to a b cup i was so paranoid worried and freaked out about what my wife, friends, family, society would think....and this forum helped me get over that. I know without a doubt if I became somehow busty as some others here who are dealing with D cups DD and such that I would have a hell of a time dealing with as at that point theres no hiding what is going on, it's going to be seen by any and everyone and if they haven't seen you in some time they obviously are going to be like wtf. But i know this forum is here to help me get through it and get the confidence in how to act and deal with that stuff if i ever had to.
Don't let the hang ups, hang up on your ability to be happy.