How I do learn to swallow my pride?

I really want to be a better version of myself. I want to surround myself with better people. I'm not sure how to refer to the energy I attract, but it feels very demonic at times.

I am the problem. I judge, I sin, I do everything I shouldn't yet I treat people like they should be perfect and make zero mistakes. I am a serious harm to myself and those around me.

My mental health has tanked so bad that I'm questioning my own sanity trying to find myself.

I've been to therapy sessions, but only until recently did one stick out to me and stick. He spoke to me about my pride, anger, and ego... He struck home with those 3 words and I almost cried.

I didn't know what to say because I don't know why I'm like this. I'm so prideful in everything I say or do, but so angry when things don't go as I wanted them to go. My mind is childish at times and I hate it.