Stomach issues

So, I’ve got a super slim build—like, I’m only about 110 lbs—but honestly, no matter what I eat, my stomach just bloats out like it’s literally about to explode. Sometimes it actually hurts, too. It's freaking awful. I seriously envy people who feel "normal." This started when I was 13, and now I'm 17, and nothing has changed. My mom knows, but we keep putting off seeing a doctor. Sadly, it feels like nobody takes health seriously enough these days.
Aesthetics aside, am I right to be worried about some underlying illness, and who should I even talk to about this?!
Anyone else dealing with this kind of stuff?

You might want to look into whether you have celiac disease.

Is that it?! 🙂