HELP!! UTI OR YEAST INFECTION?

Mollie
So I've been looking at the symptoms of a UTI and I've pretty much covered all of them, pain to urinate, frequent urge, feeling like I haven't completely emptied my bladder, pain in my lower stomach and tiredness. However I've mentioned this to my boyfriend and he's convinced I've got a yeast infection and we've both got it but I've only just got the symptoms. I don't know what it is and what I should do? Could anyone please suggest what it is and what I can do? Thank you.