The sensations of sex vary significantly between individuals. I could tell you what my experience of sex is like, but depending on your specific body, it might feel wholly different. The only way you're going to be able to satisfy that curiosity is to engage in the activity yourself.
Don't give up on finding out for yourself if it's important to you. I didn't have sex with someone else until I was 29 and then spent my early 30's making up for lost time.
For me, I was my own worst enemy. I believe that I was unlovable and unattractive (and also had some queer identify related complicating factors). I thought that sex and intimacy were transactional and that in order to find someone interested in having sex with me required me to be a person I was not. The error in my thinking was that sex was a goal, rather than a side effect of building meaningful connections with other humans.
Your mileage may vary though.
I'm sorry you feel that way, but it's not true. All you're missing is self-confidence and self-worth. It may not feel like it, but you are worthy of love and validation. Love yourself because you are alive and trying.
It's not easy, especially if you've built up a lot of myths about how you're broken or unlovable. Find the things you like about yourself and go from there. All you have to do is keep trying.