I've always been a people pleaser and a shy person. People think they can control me. Could you please give me some tips to become more confident?

Im by nature, a very overthinking person, to the point where I can't stop my brain. It's depressing at times. Everyone's happy with me until I make my own decisions. And somehow they think just cause I'm polite, they can control me. I became like this cause of my bad past, I don't know. But I want to be someone who's confident and assertive. Like, my no means no. I've been insecure of my looks, and everything cause of my past and I dont know how to leave it behind me.

I've always been a people pleaser and a shy person. People think they can control me. Could you please give me some tips to become more confident?
Post Opinion