Classify the following sentence using the following emotion categories: fear, anger, joy, sadness.
I'm so proud of myself.
The emotion category for the sentence "I'm so proud of myself" is joy.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following sentence using the following emotion categories: fear, anger, joy, sadness.

### Input:
I'm so proud of myself.

### Output:
The emotion category for the sentence "I'm so proud of myself" is joy.