Is it normal that i feel so insecure?

i dont know whats going on. my whole life i never felt insecure about the friends in my life. i loved hanging with my crew, and always felt included. i moved to a new city, got married, now have kids.... and now im trying harder than ever to maintain friendships. i go totally out of my way for my girlfriends, throwing them parties, planning girls nites out, playdates etc.... yet somehow i always end up feeling they dont include me. i feel awful and alone. why do i care so much what they think?? i think just want to belong to a group, as childish as that sounds. i have tried to expand my friend circle, take up other hobbies, but nothing is working. all i end up doing to alienting myself and family. i feel like ive just become a number and that no one wants to be around me no matter how nice, sincere i am. im so insecure, i just dont know what else to do. i should be too busy for this crap- kids, job-but yet i cant get past this. emotionally its driving me crazy.