Why? Please tell me! Please!!!

my life is hard... i always searching for love like every other guy... but im a little different, i dont just barge in n say" I like u, lets be together?"... i usually will be friends with her first... be close friends... be a best friends... then i will start my move... during that time... i will treat her very nicely... i will do what ever she asked me to... even if i have to go to the school office and ask for the key for a room(very risky) n look high n low for the things she lost.. but in the end... the secrets is revealed... n i found that she did'nt even care about me... she just using me to do all her work... using me like a tool... after im worn out.. she through me like a junk... n kick me around... y those this always happen to me... y those she have to fall for a guy that never help her even once... i help her alot... n alot!! theres never a "No!" for me... but y she just cant except me? is it because im ugly? or maybe im maybe because im thin? or is it because of my weird head-shape? y? please tell me... i want to know the answer... jusy 1 simple answer can also do... stop lying to me! T.T im a human being...