Is it okay to hold onto anger if it makes you a better person?

Anonymous
“Holding onto anger is like drinking poison and expecting the other person to die."

For a good majority of my life, people always used to tell me I would forever be overweight and that I would never amount to anything (fortunately my family was always supportive). And although I never told them, everytime a person called me pathetic, it hit me, really hard actually.

I remember holding on to this anger, for days, weeks, months even. Until finally I went into the gym and told myself I wouldn't ever leave until i proved every single person wrong. Everytime I hit the punching bag, I saw a person's face flash in my head. Every lap I took, an insult would replay in my mind and I would run faster. The pain I felt from lifting weights far outweighed any pain I used to endure when I was made fun of.

Months turned into years and eventually I beat myself into the best shape I've ever been in my life, but I realized that in a way, while I had improved my body, I had poisoned my mind and my spirit.

I was angry. So damn angry. Even years after meeting the people who used to make fun of me and having seen my dramatic change, I never forgave them.

I'm not quite sure why. Maybe I had become addicted to the fuel that their insults gave me, or maybe I wanted to hold myself over them for having surpassed them. Even now I'm not quite sure.

But after I had read that quote relating itself to poison, it's made me rethink my life. Have I taken the wrong path?
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Is it okay to hold onto anger if it makes you a better person?
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