He told me that it looks like I already have someone with me.....but I don't. I originally got Faendal to be my companion but immediately asked him to leave. So I went to Whiterun to go see if I could get that lady warrior to be my companion but she told me I have someone following me. So I went back to Faendal to see what the deal was and now he's telling me I still have someone with me. What's the deal??? I can't get a companion??

Try going back to Riverwood and re-recruting him. Then "part ways" again

thats the thing, I can't.