Ive been without love for so long I want to kill myself what do I do?

SO ive been single for two years ive only had with one girl my entire life that was the girl I broke up with 2 years ago. I care about having a special girl in my life but every girl I have chosen since then has not liked me and chosen guys besides me. This girl I have known for 12 years chose this manager guy at my job over me and it makes me feel like dirt. I dont know what to do. I need love in my life Im in this love drought and I feel terrible. I feel like nobody cares and this girl I like doesnt care or reciprocate back to me how I feel because she doesnt care. what do I do? Im fixing to end my life because it's not worth it for me to live for myself anymore. I work all day to come home alone. I am a talented person. Im great with computers and electronics I play guitar and b and I can sing. what do I lack? I have a lot of confidence in myself I do a lot and I try my hardest but it seems like girls I care about dont care about me. what do I do?