

What “Be yourself” means is: “Don’t pretend to be someone else because you think that will make you more appealing. It will likely show through that you’re not that other person and your attempts at deception will drive away the people you want to attract. Further, if you find that being your authentic self is something you are ashamed or embarrassed being, perform some introspection on what those things are about yourself you don’t like and take action to change on things you can. Examine rationally whether the thing you think is shameful is something you even have control over. For example, are you ashamed because you’re not tall? You have no control over that one. That is nothing to be ashamed of. Are you ashamed because you don’t have good hygiene? That one you DO have control over. If you don’t know how to correct that, ask for help and get to the place where you won’t be ashamed of your hygiene. You will ‘be yourself’ that is not as tall as you like, but with good hygiene.”
That’s a lot to say so it gets boiled down to “Be yourself”.
If you’re looking for a connection beyond just physical, someone drastically younger (yet still an adult) is missing much of the life experience you have. They maybe unrealistically idealistic. They may not have experienced other cultures. They may take religion at face value as the truth. All of these things are usually things that change with age. I think I would run out of patience interacting with someone that wasn’t my peer in life as a partner.