Why do my friends make me feel this way?

I have these friends who i have no problem hanging out with. I always have akward moments but the other night was too much to bear. I was invited to go out and eat with a group of girls and hang out and watch a movie at one of the girl's house. Sounds like fun right? well i was fine until i got to the house and they pulled the "I called the bed" and "I called the couch" and i didn't even have a chance to call anything because they had all called dibs on these things while i wasn't there. I'm not one to get upset about this so i just pushed it to the side and said "whatever i dont really care." Well once we started watching the movie they girls who called the couch sat on the couch and they looked at me and told me "you can sit on that chair". Of course it was a single person chair so i had to sit by myself. My best friend didn't even say "you can sit by me! like she usually would, she decided to sit next to one of my other friends who lately has been rude to me... Basically all night long I tried to include myself on conversatoins and laugh with them but nothing seemed to work. My best friend never once tried coming up to me to talk or sit by me...i had to come to her and this was unsuccesful because she would eventually walk away and go to my other friend. I feel like she doesn't even think i'm fun and has more fun with everyone else. Am i boring? Do i not try hard enough? What am i supposed to do? I miss how things used to be...me and my best friend always had fun and laughed but ever since sophomore year and the beginning of junior year things have gotten a little bumpy. We have LITERALLY every class together and talk alot but we havent hung out one on one in a while and i feel like something isn't right. I even told my best friend a while back that i felt left out and that i feel like when i talk, no one listens to me. Almost like i'm not important enough to listen to...and when i do talk and get a response, they either get really quite or laugh at me... Sometimes i say "why is everyone laughing" or "am i missing something?" but they just say "its an inside joke" or just laugh cuz i was funny. Basically, when i'm with a big group of friends something feels off and i'm always the oddball out for some darn reason and i don't know why! I just think that out of all people my best friend would want to talk to me and stick up for me right? I don't want to be out of character just to fit in either because thats not me. This is getting really long(sorry)but i've never written on of these and i'm trying to vent my feelings. I just don't know what to do or think. If you have any comments go right ahead. Just tell me how you feel about it, good or bad. I need it