The transformation from eating lunch in bathroom to varsity sports captain = excellent. But GMTPlus7 is right - the purpose of the essay is to get admitted. College applications are extended resumes, not grandiose vehicles for self-expression. I admire your turnaround and care about your future, which is why I don’t want you to see you sabotage yourself by writing an overly “heavy” essay.
Keep the eating lunch transformation - that’s a great tidbit.
Yup, this is for adcoms, strangers reviewing you for their colleges. You have to make sure it is relevant to that- not just “something” about you, no matter how important that seems to you. You also need “show, not just tell.” That’s more than saying you now interact well or etc.
The parts about your old issues can be two sentences. No matter how poignant the image of eating alone is, you have to remember the goal is to interest adcoms in your strengths.
Ask yourself why this topic would help get you into your target colleges. Best wishes.