Friends leaving me out

So in january I went clubbing and it was a bit of a disaster, it was my first time so I was nervous and I had had a bad week, so I got a little upset. The problem is, my friend never invites me on nights out again, and I am living with her next year. I explained to her that I had a bad week, but she invites all 3 girls who I am living with but not me! She also invites another girl who isn't living with us. I have had trouble bonding with my future housemates as they all do the same subject but me, and it is making the situation worse when I am not invited out. I have subtly dropped in many times that I am bored out of my mind and want to do something but no one wants do anything with me! I am lonely and depressed (although I would like to think I hide this well) because nobody in my flat talks to me but I kind of want my friend to invite me as she is supposed to be my friend? But I feel stupid inviting myself. How would I word it without soundin g strange? It rubs it in even more when she then posts the photos of the nights out saying "I love my friends" and all this stuff

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