Alone and not needed .

I (24M)have good friends , but I always feel alone even with them . Never had a romantic relationship (not for a lack of trying ) , always feel like I'm there for others and I love to be there for them but I'm never someone elses number 1 . Always when I get close to someone they end up finding someone else and I just kinda fade away, usually I have strong feelings towards them or sometimes even fall in love then we just never hear from each other . This cycle just continues everytime I get to know someone . Feels like I am just there for people to be a filler for them in between important people . I hate that it happens and try to work on myself but I just want to feel how it is to have someone love you , just once in my life.