i feel like i have nothing to talk about

i (21f) feel like i dont know how to think, my mind often goes blank and i cant think of a single thing to talk about. i have never been good at conversing with strangers, but latelly i dont think i have much to say even to my friends. i will very rarely start a conversation and it's never a long one. this is resulting in making me feel like i am boring to my friends. i also like one of my friends, but i dont know what to talk about with him as my mind becomes scrambled every time im around him. usually i start only thinking about what i should say and come up empty. is there a way to fix this?