Maybe i'm being a hypochondriac, but i was wondering, can teenagers get mouth cancer?

YES: Rare, but can happen. Be especially concerned in a tobacco user- even if not using very long. Also associated with ebstein-barr virus exposure.

Very rarely: Epstein Barr virus can cause a type or oral cancer in young people, it is very rare in the US. The common causes of mouth cancer, tobacco and alcohol are not likely to involved in a teenager.

Rare for age: Rare. See oral surgeon or ENT doc if you have any of these symptoms: Persistent mouth sore, persistent mouth pain, a lump or thickening in the cheek, a white/red patch on the gums, tongue, tonsil, or lining of the mouth, a sore throat, hoarseness or feeling that something is caught in the throat that does not go away, difficulty swallowing/chewing.