I’m bad at communicating and showing affection.

I been dating someone for the past couple months and he says I’m bad at showing affection. I get afraid to open up to him cause I don’t want to sound negative. I don’t really like showing affection cause I’m afraid I’ll be too clingy. Please help how do I show better affection to this man and show him I want him. This is a ridiculous post but I need help. Sometimes when I do try to open up to him half the time he’s high and can’t remember what he’s said.