What shall I do , Lower UTI

So I have another Lower UTI , I didn't go to my doctor when my first one happened a few months ago as it went away within a few days but I think it's came back and it's worst then ever , it burns SO bad all the time , I actually pee'd myself this morning as I didn't know weather I actually needed to go or not as it feels full and like I need to pee all the time  but I can't go doctors today about it ( I'm abit embarrassed  as I'm only 17 )  and I'm at my boyfriends today until Sunday who lives far away from my GP clinic, I don't know what to do but I'm so uncomfortable and in pain :(