Should I refuse to play in any other position?
Why would you do that?
Because I'm good at the position I'm playing in now
Don't be stubborn. Who knows? You may find out that you play even better in another position.
No fucking way. I'm good at the position I'm playing in. I wouldn't know where to go if I switch position.
Don't you want to become a better player? The best way to do that is by learning to play different positions. A versatile player can become irreplaceable to a team.