Letting Go

Me and one of my best friends were talking about people that we thought we let themselves go pretty soon.
Am I letting myself go? I stopped caring about how much I've been eating and gained a bit of weight. I haven't "obssesed" with fashion or getting a new do in a while and I have lost a bit of interest in things that I used to love. People might say it's not the eddie they used to know, BUT I don't think I've let myself go. I've just given myself a break.
Although, clothes and outfits are not as important to me as they used to be, because I have other goals that break down from this other goal I have to achieve first. I guess I'm focusing on personal achievement/self-dependent goals before focusing on physical goals. But I'm barely 17--there's still time.