What from someone's upbringing or past would cause a person to feel like they are not worthy to love themselves or undeserving to enjoy themselves and life?

i know a therapist may be better for this question but i'm wondering if maybe anyone here may have experience with this. This feeling of feeling this way has been a whole life and i wish i could figure out the cause of it.

The one thing i can think of my past was that i couldn't hear very well or communicate until i was 4...i don't know exactly how hearing and communication problems would play into self esteem