Although i have never really been picked on i have a little bully advice for you. Pick the biggest one out of all of them and deck him. It will make the others back off I had a similar experience once they where not bullies but they wanted to kick my a**. After i hit the biggest one they thought i was crazy or something and immediatly backed off you do not have to take my advice i am just throwing it out there. If you do it right it does not matter if you weigh 90 pounds or 200 pounds