Do I need to gain weight?

I'm 15 year old guy, satisfied with myself just not too fond with my weight. I weigh 60kg, and am 184cm (like 6 ft) I am obviously underweight. My dad was really skinny when he was my age I guess it comes in the genes. Though I was just wondering if there's anything I could do do at least gain a bit of weight. Idon'tt get teased at school or anything, it's more or less just for my own good. I mean I see others my age really big and stuff so could you help a brother out and give some advice? (thats if I really do need to gain some extra pounds)
Thanks a lot.

well don't gain them in fat. Eat a little more and get lots of exercise. You'll look way better, I promise.