What one thing would you tell your younger self now?

You know when your young and 'OLD' (even thought they were only in their twenties, hahahaha) people try and give you advice and you take zero notice. As you get older you are like 'yeah I see what they were saying now'... So what one thing would you tell your younger self now? For me it would be that when people are mean to you that it is because THEY have low self esteem. I spent waaaay too may years letting those people win and effecting my life. If I knew this back then I would not have suffered at the hands of all these people and it would not have taken until my mid to late thirties to get out of those effects. Your turn x