Life sucks...

Hello...so can anyone tell me...why do life suck from time to time? Why can't my life be happy and filled with fun things and most of all...love...no it has to suck all the time and honestly it's rather exhausting actually...to everyday go around and feel that you are not good enough...not worthy enough to have a normal life...*sigh*...I just want to find something meaningful to do and find some meaning to my life...feel that I too contribute with something to the world...right now I don't feel that...right now I just feel that everything is going against me...and no one single person cares...and why should they? They have enough caring about their own life...I understand that...but sometimes it would be nice to have someone care about me too...