Feeling a little left out

So three of my friends are going shopping today. This group of three includes the girl who is ignoring me. I am apparently uninvited on this trip. Now I think these plans were made last night when I had already gone to bed. So that's why I wasn't included. And it's not like I could go anyway because I have lots of studying to do. It just hurts that I wasn't asked. Now I'm wondering stupid stuff like if they all don't like me. So yes I feel left out, even though I couldn't go anyway. It's just nice to be asked.