What can I do to feel normal again?

Lately life has been pretty fd up for me. Im not sure what I should do. Im only a teenager and I already feel like "ending" it all. All I seem to do these days is waste time infront of the t.v, when I go out i just look at things and picture how I could possibley kill myself with them. I told my parents I may need to see a counsellor or something and they just laughed at me. I dont have anyone to talk to. I was wondering, what I could do to feel o.k again?