Does anyone ever just feel completely worthless? Embarrassed for where they’re at or what they’ve done?

I constantly struggle for being a burden on my SO. Even when they reassure me I’m not a burden and they love and support me. I can’t help but feel like I’m holding them back or not enough. I feel like I can’t contribute completely and every time it’s one step forward it’s two steps back. 

I’m so exhausted from these feelings and whenever I feel like I’m making progress and doing good then a big wave of failure overcomes me and I just curl up in a ball and can’t move or function. 

Really just want some assurance I’m not alone.