Penis size is REALLY variable. I am not entirely certain what is "small" in the medical sense of the term, but I really do not think you are suffering from micro penis.

As for the foreskin issue, there is something you can do about that, which is DEFINITELY NOT to have it removed. It is not normal for it to be as tight as you have described, but there is a REALLY simple procedure which can be done to alleviate that problem, which is called PREPUTIAL PLASTY. This is done under a general anaesthetic and takes around 20 minutes. Yes, it will feel a bit sore and uncomfortable afterwards, but by the next day this will be gone. Within a month after this, you will be retracting your foreskin like any other guy.

PLEASE do consider this as opposed to circumcision. I have seen guys that have been circumcised who have been unable to walk for a month afterwards and a year down the line they are still in pain. Wearing underpants for the first time was agony for them and the amount of sleep they lost due to the fact that the sheets touching the totally bared foreskin aged them 10 years in the first year. You may have to fight a little to have this procedure, because as yet some urologists are still living in the dark ages, but trust me, you will feel much better once this is done. If it is causing you to have a smaller penis than what you think is usual, then this is the time to do something about it, rather than wait ten years (or more) down the line. Now, you are still a growing lad and many things can change.

I have a lot of experience with this issue, so please do not hesitate to contact if you need more help.