Exercise and eat well, take care of your body! I had been called lanky all my life (currently 18), since about 17 I've gotten some more "shape" to myself from sports and just growing up. Embrace how you look and love it, I know I miss my lanky days from time to time. You can do some weight training to gain muscle (much better for you than gaining fat), takes persistency to see the results but it's really worth it and has lots of benefits!
You are almost six feet tall? Wowie! Well, it is hard to eat enough for such a tall frame. Exercise and eat well and hopefully it all evens out. I'm sure you are gorgeous!! Most would envy being that tall and feeling like they could gain a little weight. But we all know, the grass isn't always greener. Good luck hon
don't worry annabell i got a super thing that will make you really happy just get in touch with me to know better !
Don't worry about it! It is better to be skinny than fat but if you are to worried about it talk to a doctor or your mom