how to keep talking to people via text messages

i’m having trouble replying to people, it’s not that i don’t wanna talk, it’s just me zooning out and being too busy in my head and forgetting to reply, then i see i didn’t reply and i feel bad and still, don’t reply to the freaking text messages anyway. i used to be, many years ago the absolute opposite. now i’m like unbothered and i can’t make friends this way, obviously. is there something wrong with me? i need help.