UTI help

so i had sex on wednesday and got an uti and i also just graduated and my mom keeps telling me “youre grown, do it yourself” and won’t help me at all when i asked her to take me to the doctor. i don’t know who to call, who my primary doctor is now since i turned 18, id get one of my friends to sneak me to the ER but i don’t have money for that and i dont know anything about my insurance. my mom won’t tell me anything except “drink water” and how im “grown” and im so frustrated and feel so gross. please help. i want this uti to go away and i don’t know what to do anymore