I cant live without this girl....i almost killed myself?

ive liked this girl for two years and were close...and not akward but i found out we can never be together or anything..and its seriously tearing me apart, and even worse alot of guys want her so i feel even worse...all i do is daydream about her in good and bad ways and im personally embarrassed because i can't find any other girl....i attempted suicide already and i see a therapist but its not really helping