I had the same problem at it took me 3 days to take it off... That god my instructor was the gem he was and was happy to stick with me... Don’t let it discourage you as you will do it!
Try to partially flood the mask to a level that you are comfortable with, then take a few breaths, then when you can do that, do it again with a fully flooded mask, take a few breaths, then when you are comfortable, it doesn’t actually make a different if you have mask or no mask as you eyes and nose are fully surrounded by water anyway.
Don’t forget to tip your head to the side to avoid the bubbles going up your nose! This way worked for me...
YOU CAN DO IT! Just be patient, don’t panic, you will get there :oD
Good luck!