How come when i eat alot and dont gain weight?

I'm 13 and I wouldnt say I eat a lot but I eat a lot of snacks and I weigh 101 pounds and I still don't gain weight can it be parasites im getting a little bit freaked out my mom weighs 128 and she said as a teen she would eat junk food and she was still so skinny were both healthy so does that mean that I have high metabolism? We both run by the way but I haven't ran in 3 weeks since its vacation and I don't have soccer during vacation and I'm still the same weight please help thank you :)
 
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