Adolescent in need of weight help!!

Patient: Hi! I am an 18 year old female who is slightly concerned about her weight… I am extremely active, I swim between 1 1/2- 2 hours a day 6 times a week and do hour long drylands 3 times a week. My weight fluctuates between 130-135 ibs. on average. I am wondering whether I should have an worry because it has been eating away at me.Thanks!-Concerned HS senior