Hey im 15 nd my penis is 5 nd a half in long when erect. When a girls sees my penis for the first time, is she gonna think it is small or big?

yeahdude small mine is 7.5 inches and i am only 13

its not how big your sword is its how you use it. but you can win a war with a needle!!!

Dont worry about your size it how you use it that matter. By time you are 21 that pretty much what size you are going to be. Most men are naturally between 5-7 inches anyway.

If you have had lots of foreplay and she is really hot she will not even notice. When you stick it in she will go crazy and begin to moan. You probably will cum to fast so jack off during the day that you expect to have sex. It will help you last longer.
You dick size is fine. Learn how to use it. You can make a girl go crazy with a four inch dick if you use it right.

most full grown adults are between 5 1/2 and 6 1/2 inches...so ur just on the lower end of average...and perfectly normal for 15.

as for wut a girl will think wen she sees it...hard to say. if she's never seen one b4 she probably just think that's wut they r all like...if the last time she seen one was on a 13yr old who was less than 5inches, she's gunna think ur big...if her last BF was hung, she will think ur's is small...

either way, ur size is normal

At 16 I had my first experience, but did not have sex. I had to give oral to my next door neighbour. She masturbated me I would have been 5.5" at that time. she said it was cute (knowing it was not big) but she did like to caress it and play with it.
Dont worry about the size. offer to go down on her and do not show any repulsive body language. Ask her how she wants it sucked and licked. She will like you more for offering first. Dont worry too much about the size ensure it is erect right through... it has to be erect..

thats below average but not small, im 15 and mine is 6.75 to 7 inches, it will grow sooner or later