Can I take my cast off early I dislocated my ankle?

No!

I dislocated my pinky finger and had to wear a guard around it and the whole thing wrapped up in an Ace bandage for a month and on vacation to Hawaii! The doctor said a dislocation is actually worse than a break. If it doesn't heal right you can have arthritis pain in that area the rest of your life. So I wouldn't if I were you! There is a reason they are being careful with it!