Why am I like this?

I seem to be weird when it comes to receiving and giving affection. I get nervous when I think about being in a relationship and having to be intimate, even small things like kissing. I also cant eat in front of my date. Like I feel sick and feel embarrassed. Why am I like this and how do I ease myself out of it? I’ll end up liking the person, but I’m miserable inside because of these worries l put upon myself. I have a date Friday and need help! 😭😬