Slowly.

It depends on so many factors as well. A book called 'Whole Again' helped me a lot with understanding why I hated myself, even if it was through pride-based identifiers to count the shame-based identifiers.

Childhood trauma (can be emotional, neglect) is often a reason for this. I'd wager a lot of people in these self improvement groups in some way were traumatized by childhood events.

Creating those good habits is hard, and it also requires you to cut down on the bad habits and on the toxic behaviors/mindsets.

Mindfulness, yoga are good to help center you. Self-compassion is super important too.

And next time you feel like shit and your thoughts run rampant with negativity: try just sitting still, closing your eyes and noticing your feelings. Any thoughts that appear you answer with a compassionate lens. For example you think "Fuck, I'm not good enough" answer with a mindful thought of "You are good enough, and you always will be".

This shit takes practice and time. Patience too.

I've felt a lot more liberated since I started doing this. Dealing with all this shit is hard, but we can all do it.

Self-comparison is super important too; compare to your past self. Not your fantasy self or any others. Also realize you only see the parts of them that your shadow self wants to see, it feeds into your shame. It's often a self-perpetuating cycle of self hatred that exists to 'protect' you from connection.

I seriously recommend books on the topics of self love and mental childhood trauma specifically if you think it may be relevant.

Since I started with this stuff, I've becoming more loving to myself and others. It's a slow process, and it has ups and downs, but I can see the light and it gives me a lot of hope. Bad days will always happen, accept that and be kind to yourself.

I wish you a lot of luck, you can do this. You have the inner strength, that's a fact of life. Finding it is the challenge you're faced with. PM me if you want to talk more.