why i feel myself is useless and just cant do anything?

i joined a club in my uni, and they have a party today, but i was so nervous and it took me half hour just to think i should go or not, finally i decide to go , but i just stood in front of the door and use another 20 minutes to think how embarrass i will be if i going in, i just so afraid of socializing and i don't know what should i talk with them, oh plz help me. ps, my English is not good, thats why i dont know how to talk with those native speakers.
 
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