Yeast infection?

Hey ladies, so I've never had a yeast infection before and I'm almost 15 and for the last 2-3 days my vagina has been incredibly itchy especially with a tampon in, i think this is the cotton irritating it even more. I've also had like whitish brownish discharge kinda thick maybe even chunky consistency that smells. I don't know how to explain the smell it's not fishy or anything like that but it doesn't smell normal and it smells pretty bad. I don't have any pictures so I may add one later tonight if i find any more discharge. My vagina especially the opening also feels swollen. Can you ladies please help me out and let me know if this sounds like a yeast infection.