I can’t sense someone. I’ve never ever had that happen before. What does that mean?

So this is obviously new to me. And I’m finding myself freaking out. I even held their hand and nothing. And what’s weird is it’s always in group settings I’m around them and so it’s takes a minute to realize I can’t sense any thing from them. The first time I was drinking so I thought maybe that was it. But last night it happened again but I didn’t realize it until I went home. And it freaked me out. I’ve never had that before and for it to happen more than once scares me. I want to know what this means. I’ve been saved more than once because of being able to do this so it’s like I’m blind to them and that really does scare the pants off me. So has anyone been through this or know what it means??