I want to but dont...????? please help?

My friends (Loz, amy, jess...) go to this skaatepark andhang out and they asked me to go. I would really like to go, buti fear i will be left out... They all know most the people there, so i dnt want to be left out.???? what shall I do??? I sed i wud go on saturday so plz help asap... x