Big anxiety issues when it comes to social events(parties, clubs), help!

So a girl on my co-ed soccer team recently invited me to her birthday party next saturday. She knows I work Friday/Saturday nights but she just put it out there in case I wanted to come or something. She didn't invite any of the other guys on the team. I never really have been to many parties, they were more of get togethers with many friends. The last party I really remember going to was one 2 years ago in my senior year of highschool. My friends who are the "cool kids" invited me to a party, but I really think they just wanted a ride there :P Anyways, I only knew my 3 guy friends and i didn' talk to anyone for the entire night. i was either outside smoking or standing around in a corner looking like an idiot. This girl is turning 23 and i'm only 19, this means that all of her sexy girlfriends will be approximately her age (or older), and there will probably a bunch of older alpha-male guys there too. What is holding me back: -I have Very little party/club experience -I Don't know ANYONE except for the birthday girl -Everyone will be like 3 or 4 years older than me -Afraid of talking with the birthday girl for 5 mins and then standing/sitting alone or making awkward small talk - I really don't think I have any "game". - Watching people play beer pong and then be coerced into participating or cheering loudly (these kinds of things make me very uncomfortable) I was the only person that she invited from our soccer team, I don't really know how to take that. I know she has a BF, so she probably isn't hoping to hook up with me (not that I would really know how, anyways) and I'm not hoping for that either. At school people expect to make friends, meet new people, whatever. But at a party or a club, it's different. I think everyone kind of brings their A-game expecting to hook up or bring someone home or impress other people. I'm really shy and I don't know how flirting for an extended period of time would work out. She said if I'm working I should just drop in and say "Hi!". Even though I'm not working I might just pop in for a bit and then say I have to go. Has anyone ever been in this situation? Or been an introvert or something that spontaneously burst out of their shell? I already booked the day off work. If I p*ssy out I will end up working on many assignments due next week, but if I go - 1)i might meet new people n possibly have a good time or 2) look awkward in front of her friends and make her think i'm not the cool playa playa she thinks I am.

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