I am insanely self conscious a lot of the time. How can I change this?

I feel really awkward a lot of the time, but I love speaking in public and being on stage. I feel like someone is watching me when I'm alone though. When I get in the shower, or write, or do anything personal that I see as a vulnerability, I feel like I'm being judged. It's only when I'm reminded of it. If I don't think about how someone could judge me, I don't freak out. How can I change this mindset? Tips? Thank you :)