I was the president of the, "I hate myself for no damn good reason club"
I always knew I hated myself, but never cared enough to turn that around. After all i "wasn't" worth of caring for. Even up until I was 4-5 months sober I had yet to discover self love. With my clear thoughts and emotions I realized I built my castle on self hatred. Every key player in my life knew it was "ok" to treat me that way.
So to your question how to make you care about you. You just do it. You give that hurt child inside of you a big hug. You tell that child you're not going to every hurt them again!! And you tell that little lost child from here on out you are going to protect them, make them whole, let them grow in a nurturing environment and then set that hurt child free!
Once you get started on loving you look out world!!