I Hate My Job

Hey, your probably reading this cause you hate your job aswell. Well this is my story. I'm 18 years old 19 in october, I graduated highschool and met a girl, she means a lot to me and so does her family, we have been dating for 2 years but anyways, her brother in law got me a job in the sheetmetal trade which I thought would be fantastic.. I was wrong I've been here for a year now and i absoloutly hate it. I was never good with math and thats all it is, I get a lot of slack at work even though i bust my *** off everyday. I have no idea what to do, I bring work home with me in the grumpiest mood and it doesnt make life easier. What should I do? I have grades for College. So I went career crusing, did a series of questions and got more than 40 job titles with the answers of my skills and likes and dislikes. Hopefully I find out what I really want to do..