How much self-control do you have? Do you wear your heart on your sleeve, or do you have the ability to hold in your thoughts and feelings? I think most people are pretty good at keeping things in. Writers seem especially so. We wear masks to fit whatever situation we're in.
Somebody is having a bad day, you become kind and caring, trying to get them to feel better. Somebody else is having a great day, you feel great and celebrate it with them. Sometimes you can do one right after another. With texting and instant messengers, you can do both at the same time.
How is it that we can console one person and tell goofy jokes with another person at the same time? It's like we can flip a switch in our head and change between our personalities. I think it's weird, but it's also pretty cool. We should make use of this ability more often.
Add the writer's mask to your switches. Flip the one that makes you a great and inspired writer who can do no wrong. If you can switch between all the rest of your personalities, this one shouldn't be any more difficult.
Give it a shot. Let me know what happens.