How do I overcome this shame?

Be yourself and don't let others make you feel wrong to be who you are. Everybody is different and likes what they like. no one has the right to make you feel bad for what you like or do, because in the end they are no better than you or anyone else. If u like Celine thats great! She is an amazing singer and its fine you like to showcase that. If you are ridiculed by someone they don't really care for you as much as they made you think. I hope im making sense to you and that my answer helps you in some way. Take care and i hope you'll take my advice. I hate it when people feel bad for being themselves, theres no need for that! Be strong ^_^ Surround yourself with those that except you.