Should i quit my job?

i recently started working at a small office where the owner is the boss. i work off the books (cash) so i cant report the boss. he hired me to do filing (several months overdue) and i swear it was like 4 drawers full. after he hired me he told me he'd only pay 7/hr however for filing of that degree you are supposed to be getting at least $10-$15. i thought i would get more after them seeing what a great job i do...nope. i did 48 hrs and got $336 only. not only that, the boss texted me on the 3rd day after asking for my # to make sure i got home ok.he texted "i like u" i ignored him to make it less awkward and said " thanks you guys at the office are nice too." he always calls me pretty, recently called me babe and baby, offered to take me home, when i excessively refused he insisted and took me home all the while driving his fast car "fast" in order to impress me. im 18, he's 36 with a wife and 3 kids. y would i be interested? another of my coworkers (girlfriend and 2 kids) likes me and they both flirt with me. i did not lead them on. i know women get unwanted attention sometimes so i cautioned myself and all i did was be polite and smile and greet everyone individually when i came in. i made it clear that i didn't want personal relationships by refusing rides, food, and sticking to work (did all that filing in a week thank u :). my office is all men, all older than me. after i realized my boss liked me i decided i had to do something or quit. i decided to stop smiling, stop interacting as much with them and just focus on work as i had been doing. i hoped they would get the idea that i am not interested. they have :) but they still flirt and call me "baby". they are dogs, and today they asked a customer about sex in front of her son. this office full of guys is JUST LIKE a bar. talks of girls, money, receiving oral sex, cheating on wives, racism against blacks, DRINKING..(no lie!), theres samuel adams in the back, some employees smoke, and all in all im feeling out of place. if that works for them, go ahead, but they expect me to interact with them when i have nothing to contribute to the conversation. im a nice, polite, good girl who wants to work and make money for the summer and thats it! but i can't get another job, trust me i've tried. so what do you guys recommend? i do need the money, but is $7/hr worth the atmosphere? i am extremely unhappy at work. i stay in the back room and do filing and my coworkers always say "hey y don't you come eat/ hang out with us? and i think 'well its cuz if i so much as SMILE at you you think its ok to flirt with me, and i have no interest in talking about cars and p..s.sy.' (i'm sorry for the vulgar language but thats really what they say). im one 18 yr old, pretty girl with big boobs to 6-9 guys,why would i entertain inappropriate behavior in any way? so is there a way to get through this? is there a secret to working with men when you are the only girl? and should i quit or stick it through?men please tell me if you understand where i am coming from. because the boss and coworker that "likes me" (cough*my body*) seem to not get why i am all of a sudden less approachable with them.