I'm an idiot that going to be single forever

I'm introvert and really bad with talking to ppl. But this guy that works at my sister job and i went to school with always say hello when he see me. Mind you we never talk before at all. So one day my sister and i are food shopping at her job he come and say hello like usually then leaves. when I was left by myself he came up to and asked for my sc and I gave to him without thinking. i was kindly happy about and we kept giving looking at each other. fast forward later my heart stop when texted me and i was panicked on wat to say to him but we did talk lil that day. next day he asked 'wat do i like to do?' for 13 fucking minutes i thinking wat do tell him cuz i don't wat to lazy and boring saying i love spending time in my bed reading books and manga's. so i called my sister asking her wat to do and wat to say, then i just told her when you see him just tell him i not good around ppl idk. i never texted bac after that so as him. i give up talking to ppl, i never know wat to say and i struggle with say words that never come out right ┗( T﹏T )┛