UTI really?

So this week I got an itching sensation in my vagina the next I see withe spots on my underwear so went to my gynecologist and asked her to give me medication for a yeast infection so I thought because I had it seven years ago. Yesterday I googled my symptoms after my friend told me It m’y be a UTI i didn’t even knew what it was. Now I don’t know what to do I’ve been screaming at my boyfriend like he’s responsible i was the the one who went to a public toilet on the train now I pay for it.