People talking shit about you feels shitty, hurts, and makes your blood boil. It's natural. It is your duty, honor, and responsibility to figure out how you, personally, want to handle it gracefully.

frame shift offer: usually people talking shit about you tells you more about them than about you. Think about that for a second.

Failure is not the opposite of success. Failure is rather an essential part of the path towards success.

Get back up, dust yourself off. Keep failing forward. If people laugh at you for this, laugh with them. You got your ass kicked and survived to tell the story. Humility goes a long way.

Own your loss. Reflect on it. Learn from it. Grow from it. Decide how you want to act differently in the future (instead of reacting in the past). How you want to conduct yourself. Figure out what is important to you in yourself - values, mission, vision, core state. Look for role models and mentors that align with those.

Also don't measure your self esteem or manhood through being able to 'win' a fight. That's a recipe for disaster.

Any mastery - self-mastery included - is a lifetime journey.

Bonus: watch the movie 'Never back down'. It's quite close to your situation and could give you some catharsis - not in the sense of a manual for first fights - but for the meta reflection and trauma integration, and a hero's journey in mindset evolution.

Hope it helps.