Anxiety problem?

why is it that everytime i go outside or when im around people i start feeling nervous and my body starts heating up and start feeling paranoid its a bad feeling like i dont exist ?? i start trippin out..its terrible would some anxiety pills help or something else to calm me down i have a trip to puerto rico in a day and dont know if im a be able to do it i might be in a damn room all day so i wont start feeling like thiss ... =[