Frnds help me...i am suffering from depression..?

frnds...please help me...i am suffering from depression... :,( ...just now i am a teenager...in grade 11th...i don't know why i can't focus on my studies now...in grade 10th i had topped my school...now my school has changed...and in the new school, girls are very rude...my self esteem has gone down...i have lost my self confidence... :,( ...i know that i can read my books and understand them, still i don't know what is holding me back...i don't want to discuss this with my parents as i know that they will not understand...they have high expectations from me...my goal was iit...but now that seems blured...suicidal thoughts come in my mind now... :,(((....i really need urs support...urs love frnds...help me...