My first piece of advice would be to always believe in your gifts and to not let anybody tell you who you can and can't be.
Study hard and work diligently, ask for help from other musicians around you, and don't take constructive criticism personally. Instead see it as an opportunity to grow.
However, you get to decide which direction you want to reach your branches in, always. Listen to others' opinions, yet form your own using your own intuition and judgement.
Lastly, if you haven't already, learn how to breathe from your diaphragm. Once I learned how to breathe properly, I stopped straining my vocal chords and difficult lines became easier, it's definitely an essential for the aspiring singer!