I brushed my cheek too hard on the left side and now it feels rough when i touch it with my tongue. this is probably due to trauma? im 16 btw

Probably: Yes; however, good news is, chances are it may get better over a short period of time. Consult your dr, and let your parents know if it persists. Be careful next time, but please do not let this happening deter you from a (careful) dental hygiene. Congrats for that.

This will pass: Abrasion with tooth brush. Try gargling with weak saline solution. See doctor if fever or pain worsens in 36 hours.

Yes from trauma: Yes it is from trauma due tl brushing too hard.It will get better by itself.

Thanks for asking!: Most likely you brushed your cheek too hard. Just don't brush on that side for at least 2 days so the tissue can recover.