Advice to My Younger Self

Don’t take things too personal
Take a short pause and remember that hurt people hurt others. 
Deep down inside, you want to take the time out and break their vocal chords. Though, the person that doesn’t like you for no reason or the messy secretary are hurt/have lots of time. Hurting them anymore will always feel good no doubt, but will make the nerves in you last longer. Key word time. Every sentence in this paragraph here involves time. Don’t join the hurt club, you waste time. Less time, less money, less spa time to forget about the haters. See where I’m going here, it’s better for your mental health. 
Take time to love your insecurities
Why do babies kiss themselves in the mirror and most adults don’t.
There was a time when you didn’t point out features you didn’t like on yourself. Ask where do these feelings come from. Surround yourself with positive images of those features and positive people wouldn’t hurt either. Learn how to carry yourself in a way you feel comfortable and in a way that flatters those features.
Consider the criticism
Destructive criticism doesn’t offer solutions.
Even worse doesn’t want to offer help and rather personally attack or bash. Criticism is beneficial when those bias are out and the facts are in. Ideally, the best criticisms are profitable when a tip is offered. It’s ok that it hurts, it’s going to. No one wants to get told they’re a bad singer. Look at it this way, you’re one step closer to being a bad-ass dancer.
Consider the source.
The person who is telling you to never trust a perfusionist probably never met a perfusionist. Or for that matter, doesn’t know what a perfusionist is. You’re probably looking up perfusionist now.