Hostile Work Environment/Sexual Discrimination

I have been working for my current employer for over a year now. Throughout the 16 months or so I have been working here, all of the other female co-workers have quit due to the treatment they recieved. I have only stayed becuase I cannot find another job and have to pay my bills.
The problem is that I am totally offended, stressed out and at my wits end with this employer and male co-workers. I am treated unfairly and my needs are disregarded (where as, if one of the male co-workers needs something, even if not for their health, they are granted their wish. I asked for a certain day off since working that shift would make me stay up for 48 hours straight, but I was told that one of the male coworkers liked his schedule the way it was and nothing could be done to change it to help me out.) On top of that, everything and anything I do is overscrutinized and belittled. I have made copies of notes and comments left about my work. When I worked overtime becuase one of the male coworkers was over 45 minutes late, I was told that they do not pay overtime and I would have to "work it out." Before the assit.mgr [a female] quit (due to her recieving the same type treatment) I was informed that after a year of employment, I would recieve a paid vacation. I had my vacation days posted and everyone knew. After I took my vacation and recieved the paycheck, I noticed the hours for my vacation were not posted nor paid. When I inquired about my missing hours, I was told that the manager "only gives paid vacations to whom he wishes, its like a favor" So I wasleft without my hours and was unable to pay all of my bills that month. Due to not only the stress, but the apathy of my coworkers (showing up unreasonably late) I have missed many days of school and my GPA suffered from the days I missed. All areas of my life have been affected and since the manager and coworkers are all involved, there is no one I can go to to try and get help for this situation. I feel it is inappropriate to treat me in such a manner just because I am female. If I do something that one of the other male coworkers has done, I get punished, repremanded and/or belittled. They recieve no sort of punishment. [Example: I may get here 5 minutes late tops. I get chewed out and treated like dirt. The male coworkers are frequently 30, 45 minutes late and they recieve more responsibilites and possibly pay increases for their supurb work--a bit unequal, I think]

Please help!! Is there anything I can do??! I have no other options right now and am stuck between a rock and a hard place.

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: I have been working for my current employer for over a year now. Throughout the 16 months or so I have been working here, all of the other female co-workers have quit due to the treatment they recieved. I have only stayed becuase I cannot find another job and have to pay my bills. 
: The problem is that I am totally offended, stressed out and at my wits end with this employer and male co-workers. I am treated unfairly and my needs are disregarded (where as, if one of the male co-workers needs something, even if not for their health, they are granted their wish. I asked for a certain day off since working that shift would make me stay up for 48 hours straight, but I was told that one of the male coworkers liked his schedule the way it was and nothing could be done to change it to help me out.) On top of that, everything and anything I do is overscrutinized and belittled. I have made copies of notes and comments left about my work. When I worked overtime becuase one of the male coworkers was over 45 minutes late, I was told that they do not pay overtime and I would have to "work it out." Before the assit.mgr [a female] quit (due to her recieving the same type treatment) I was informed that after a year of employment, I would recieve a paid vacation. I had my vacation days posted and everyone knew. After I took my vacation and recieved the paycheck, I noticed the hours for my vacation were not posted nor paid. When I inquired about my missing hours, I was told that the manager "only gives paid vacations to whom he wishes, its like a favor" So I wasleft without my hours and was unable to pay all of my bills that month. Due to not only the stress, but the apathy of my coworkers (showing up unreasonably late) I have missed many days of school and my GPA suffered from the days I missed. All areas of my life have been affected and since the manager and coworkers are all involved, there is no one I can go to to try and get help for this situation. I feel it is inappropriate to treat me in such a manner just because I am female. If I do something that one of the other male coworkers has done, I get punished, repremanded and/or belittled. They recieve no sort of punishment. [Example: I may get here 5 minutes late tops. I get chewed out and treated like dirt. The male coworkers are frequently 30, 45 minutes late and they recieve more responsibilites and possibly pay increases for their supurb work--a bit unequal, I think]

: Please help!! Is there anything I can do??! I have no other options right now and am stuck between a rock and a hard place.