Welcome to PC. I think you can find a lot of help here.
It doesn't sound like depression to me. That really depends on all your symptoms, how severe, how long, etc. Definitely feelings of low self worth and inadequacy, issues around your parents divorce, and maybe issues in childhood before that. Kids always blame themselves even if you understand rationally it isn't your fault. And it is common to build walls as a defense mechanism to shelter us from the trauma and emotions it causes us. You can only keep things walled off for so long before they start affecting you.

I would suggest therapy.

Here are some links for areas on this site you might find helpful. Keep posting.

Types & Symptoms of Depression | Psych Central

Psych Central - Depression Screening Test

15 Common Cognitive Distortions | Psych Central

Fixing Cognitive Distortions | Psych Central

Steps to Better Self-Esteem - Forums at Psych Central

Self-Help Ideas and Goal Setting - Forums at Psych Central

Self-Esteem | Psych Central

Is Low Self-Esteem Making You Vulnerable to Depression? | World of Psychology

How To Raise Your Self-Esteem | Psych Central