It depends completely on your job, I graduated last summer and work full time in retail. This isn't 9-5, it is variable shifts, sometimes I get weekends off sometimes I get week days off. Sometimes I start at 7 sometimes half 11 0r 12. Sometimes I finish at 4, 5,6 or sometimes 9. It adds a bit of variety to your working week. However now I have just landed a role as an overseas representative with a large travel company and this is something totally opposite to 9-5. Hours are spread out, it's sunny. There is one thing that all kinds of jobs have in common though and that is that you've got to work hard ! Sometimes you just have to stick to a job as a necessity, and not one that you particularly like, not everyone can walk into their dream job straight after graduation (IF ONLY) and even when you do land your dream job, it still involves hard work. Compared to uni it is hard, yes, you are out of that uni bubble and into the real world ! After a week or two you should have gotten yourself into a routine, which makes it easier. Although, with all due respect, at 21 and with no work references where are you thinking of applying to ?
good luck