Important question....

Okay so I’m young...but..Uti...how do you know if you have one about 3 days ago my boyfriend like rubbed/fingered me waaaay to hard(with pants on) an it was red, swollen and hurt to pee but I put a wet rag on it every so often...it’s gettin better,but like I’ve asked and people have said maybe a UTI or rug burn...but yet again since I’m young if I have a UTI or something it’s not like I can just be like....mom balaha blah ablah...I’m just really scared and don’t want to have a UTI...I haven’t really learned about that stuff so I don’t really know what it all is / what it does.....I just want my nerves down really I’ve been so stressed about it...please help!!