Have there been any other signs, like pains in your stomach, lower stomach, or exaustion (such as being tired)?
From what I can tell, some parasites can cause constipation, but do more than just that. It's probably not a tapeworm or other parasite if something else isn't happening.
Some people have different bowl movements than others, but it may be the types of food you're eating.
You starving could also mean that your matablolism has sped up due to puberty. I get a little hungry every couple of hours and I'm as thin as a stick lol
Wait a couple of days before thinking there's anything too wrong! It takes time to really see what we're getting at.
So yeah just get back to us