Your prob going to grow some more at 15, so dont worry about it. I was supposed to be UNDER 5' tall, but I took HGH for 3 years many many years ago. (before you were born) Mine was for MEDICAL purposes and a GH deficiency.
My suggestion is that unless you are going to be VERY short, dont worry about it. Its not a huge deal. And look at it this way, its better to brag about being small and short and throwing up big weight.
When you see guys taller and bigger throwing up the same stuff or less, it makes you happy, or at least it makes me happy.
And look at your bodybuilders as well. Not that you want to be one, but they are all in the range of 5'5-5'9 minus a handful of them.
Yeah, i'll admit that sometimes it sucks when your around taller dudes, but I always use my strength and physique to help me get past that sometimes. I'll be like... So what, the dude is tall. Bet he is a pansy too.
Or i'll make some smart ass comment to a girl I know about... Your boyfriend may be tall, but I bet I could beat his ass hand down in the gym.
Or sometimes i'll get a small joke from a guy and then go... Bet I can out lift your ass, and second, I look better than you. So yeah, your girlfriend should be scared.
Its all mentality for me, and what ever I can do to make me see the other side, I use it to my advantage. I remember the first time I stepped into the weight room I was scared ****less in a way.
Now I go in there like I own the place, and know, I go quite well for the size I am, and no one every says a word because when they see me workout, they usually are in awe.
I know that wasn't what you wanted, but i'm fine with my height, and if I was taller, that would mean more weight to push and gain just to look good.