my t says that before you can heal, change and grow that you have to recognise the problem. It seems you've identified self esteem is a problem but maybe not what has caused it in your life. Maybe you can head in a direction of talking about that with t. Can she shed any light on why she thinks it is something you're struggling with? Try to engage your t in the process. That might help you understand the situation more.

my t also says the key to building self esteem is be kinder to your self. In other words, to work on accepting the parts/aspects/qualities of yourself that you don't like. Parts of you don't have to be lperfect to be likeable... it is such a personal journey that i can't see self help books being of too much use. that's where i am now-learning to recognize not liking something about myself and being kinder to myself. t says the spectrum of what is likeable is wider than what my perception is. It is hard. I hope this makes sense to you. It is very close to my work right now.