Exactly what @sakuchi said. She's confused, doesn't know what she's doing and doesn't know how to rely on other people. Dating was never part of the equation before (at least, not to her sober self). I think usually when you encounter this situation in manga, a character like this will usually compensate by trying too hard. So, it's strange to see a character who doesn't seem to try hard enough.
I've got to say, I can kind of relate to Megumi. I'm in my 30s and have never really had any kind of romantic relationship. I know that if I suddenly started dating someone, I would have no flippin' idea what to do.