well first - chin up,
for most of the people who had negetive expirience have more difficults to get along with new people. but once you do get hooked with friends, you'll enjoy the results far more than someone else.
first i'd advice you to meet new friends at non-clubbing enviroment (no pubs or clubs)
try to join new groups of friends from jobs, school, neighbors and family ties. people who you can trust.
start to be more positive and build yourself hobbies and character. make sure, it's comfort, playful and such positive things. don't use the computer or facebook much, sometimes it hurts relationships.
learn popular things that you can teach your friend like surfing, dancing, music and even hooking up with girls.
good luck
