UTI??

So, i'm 17 years old, and last night i had intercourse with a boy. It was kind of rough and he was finger banging me pretty hard. We were at it for like 2 hours... 
Now ever since i woke up this morning my vagina has been very painful and it burns very badly when i pee.. I can't even move or sit down without looking like i'm 90.. 
Ive never had a uti so i can't be certain it's that.. does anyone have any ideas of what it could be? Thanks in advance 
UPDATE: i now have like a light brown mucus like discharge? 

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