Why are we awkward with each other? Please help?

Iamconfusedd
Hello! I'm hoping for you guys to help me😄, basically I'm 20 years old and I've never had a boyfriend, never been in a relationship or even flirted with guys. Last month I got close to my colleague at work and he's 26. We followed each other on IG and we talked about life I'm general. Then he started flirting and I flirted back and now we're sort of, I don't know, in a companionship I guess 😄. I really like him and he's told and showed me many times that he likes me. But I'm so awkward and insensitive around him, that I feel bad because I don't know what to say around him. And he feels the same way, we actually talked about how we're so silent and awkward around each other. We literally just sit down and be silent together, when we hug or cuddle, we can't think of anything to talk about. We just lie down, in silence, Thing is, whenever I'm with him, my mind goes blank, I get so nervous, so giddy that I can't think of anything to say. But when I'm not with him my mind suddenly gets filled of all the things I want to say to him or what I should have said. He's the same too. By the way, we're both MBTI and personality enthusiasts and he's sn INTP and I'm an INFP. If that helps😅. We both talk about, how we have little to talk about even though we share a lot interests. Also, we do talk, but it's always deep discussions, We're terrible when it comes to small talk but we small talk okay with other people😅, why is that? Please help meee
Why are we awkward with each other? Please help?
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