friendship rarely last for me

I don't know why is it so hard for me to maintain friendship. I always try to be good with my friends, I helped them, I always replied to their messages.. I joke with them, but what usually happened is that that friendship doesn't last for long. And that made me feel like a bad person, weird person 😕.. I feel too scared to trust new bond now, I'm afraid they'll just leave me again in the end when they already feel bored of me. Maybe it's just me who overthinks too much, but maybe it's true. Idk, my negative thoughts win a lot..