300 Lb is as you probably know extremely overwieght for a 16 yr old. even if you are 6ft tall. Your penis is also not fully developed at 16 and the added fat in your pelvic area is going to cause your penis to appear smaller even if you are normal size. I would suggest losing wieht first, as well as just bring it up to your doctor as a concern and ask if he would recommend a specialist. I know this is probablly uncomfortable. But Doctors have seen worse and discuss uncomfortable matters with alot of people on a daily basis.
somtimes fat around the crotch area can make the penis look smaller
yes, theres a good chance of some growing still to happen...but i wouldnt risk it!
Here in the UK you need to see the regular doctor first and then he refers you to an endocrinologist, without that referal nothing done. Not sure how it works in America where you presumably from i gather...but if i were you i'd act now! All the best bud
Before you do all that i would suggest trying to lose some weight. Guys with your size of body normally have an inch at least to claim back when they lose the fat from the pubic area.
Also, as you're only 16 there's a good chance you still have some growing to do, meaning you may not be potentially that far from average, all things considered.
should i go to the endocrinologist, like Smith29 recommended me, or go to my regular doctor and tell him?
Weight actually can have a lot to do with penile size I suggest seeing a doc and discussing it.
Best thing to do is to see your doctor now! and ask him to refer you to an endocrinologist because you must have some kind of development problem. Unless you are a late bloomer but that doesnt seem the case as you're 6 feet.
i think that size is not dependent on what your body is like because i am 15 and 5 feet 9 inches and my penis (uncircumcised like yours) is 4 inches whilst flaccid and 8 inches when erect. As for the making it bigger i dont really know.