Seeking help?

Hello...I've been feeling really unhappy with myself. I always seem to find flaws, and it feels like there's always this stream of negative thoughts running through my head. I'm already underweight, but I don't feel...right? I've started to miss meals, or at least eat much smaller amounts of food, and when I do try to eat something, that same (not literal) voice starts making me regret it. I feel guilty when my weight goes up, even though I know it's supposed to fluctuate. I just really don't know what to do. Someone close to me has been worried, but my parents don't seem to think much of it. I've been told by that someone that I should see help...but I don't know if this qualifies enough.

Does this seem like an eating disorder? And if it does...is there a way to bring this up to my parents a bit more?