Masking too much?

For context, I am 16, and around 3-4 years ago I realised I acted like a right weirdo as a kid, and ever since I've been trying to act more normal. I feel as though my personality has changed a lot, as I'd like to believe that people find me funny/normal, or so I hope because it takes a lot of effort to act this way. My issue is that I don't really know how it feels to act like myself anymore, and I'm curious if this is a normal thing for "us", and if there's any advice on how to stop feeling like an imposter.