Some therapists (!!).........Of course "walking around more and being more social" is freaking you out!! (unless you haven't told her the full story??).
I'd personally say: Now, just do what you can, push but don't stress yourself too much.
Then go back to her at your next appointment and agree with her some clear "goals" e.g. I'll start by trying to extend that "hi" to "hi, how are you?", I'll walk around one/two/three? extra times in the day at.......o'clock (and x o'clock"?). You can even agree a goal (or goals?) for later in the weekas well maybe??. But whatever you feel comfortable in trying, just something/s hey???.
And you know you could maybe have a bit of a go at setting yourself some "goals" now, do you think??
And some coping techniques for if your "homework" is getting stressful?? Please tell me she's arming you with some of these as well??!!
PLEASE don't misread this though, I'm ABSOLUTELY no expert, just want the best for you!! And seriously, make sure you tell her EVERYTHING you're feeling, how difficult things are for you.
Now, HOPING (!!!) you don't feel the urge to cut quite as much???????

Alison

P.S I'm guessing this is going to be very hard to believe (maybe impossible?) but I'm going to say it anyway : The "NOBODY likes me" is really unlikely or maybe because they don't really know you, or even because you haven't got the "right" people in your life right now. It ABSOLUTELY doesn't say that you are unlikable!!!