Off topic here, but how do people cope when the grades they get aren't exactly great? I know it's normal to have to change your expectations a little when starting uni. But I feel like I'm going to fail and dropping out seems like a pretty good option right about now...
I don't know what your circumstances are, but I feel that your wanting to drop out will not be a good outcome for yourself, nor will you learn anything from dropping out. I had a terrible result this semester in one of my subjects (lowest score I'd ever had for a test at uni, and I'm in third year, so it's really important that I do well). The point is that I wanted to change subjects, but I stuck with the subject and just worked extra hard. I put in the hours, did all the practice that I could, and then lo and behold - an improvement. Sure, I have simplified whatever it was that I did considerably, but that does not preclude you from doing the same. First year can be tough; you need to learn to adapt quickly, but sometimes that's not so easy. My advice would be to persevere. It will teach you resolve if you can do that, which no doubt will be better in the long run for your person and for your outlook and time at uni. Hope this helps.
Also, email the tutors/subject coordinators if you need counsel and/or guidance. They should be able to arrange a time for you to go and work through your problems. I did that for the first time this year and it certainly helped me out.