I feel left out...any advice?

well idk maybe is because im in high school (11th grade) and people say im going through that "awkward" stage but lately ive been feeling really left out. Like a few days ago my best friends and i had a sleep over (we always have a blast together) but they spend their whole time talking to this two guys (im really good friends with one of them and i know the other guy but we dont talk as much) the thing is that i tried to make conversation with them but it ddnt work and they talked for like 6 hours...so i just went to sleep (cause i started working this summer so im like really tired all the time and bored to death since i was being excluded from all their inside jokes and stuff) Also they seem to think that im lame or something cause im tired all the time now since i started working so when i leave at like 10 or 11 pm they dont seem to understand that im tired...even if i explain. They just say "whatever just go to work tired and sleep the next day" but i cant do that..none of them work so they dont know what it feels like. Then one of my best friends (since she changed schools) has turned kind of rude and annoying. Like we would be having a good time but if someone else thinks that it wasnt cool whatever we were doing she would come out of nowhere and say she was bored out her mind. Which kind of hurts my feelings cause wen its only the two of us she is completly different...nicer. Or i would say something and then just to look cool she would say something really loud to make it seem like im stupid. Like me and this two girls are really close and i can say they are my best friends but since last week things havent been good at all....any advice??