Does anyone else sometimes feel like they have no real personality?

Occasionally it hits me that I have nothing to say. People ask me what I do, there is no concrete answer. I have few hobbies that I can talk about and I am disinterested in most things that people in my age group like.

I spend most conversations sat in silence listening to the other person talk while intermittently offering questions/prompts so they can keep talking. Sometimes they ask me questions, but I never have anything to offer.

If I was to list my personality traits, there's not much to offer. I guess I'm "nice" in a round about non-offensive way, some people think I'm smart, I occasionally get told I'm funny.

I don't get to express myself: my external body language and signals don't match up with my internal reality. I have no clue how others perceive me, but it certainly doesn't match how I view myself. I'm a completely different person in my head.

Does anyone else feel like this?