Rejection Sensitivity keeps causing me to burn bridges and blow up my own life

If I feel even mildly unwanted or devalued my instant reaction is something like "You don't want me? Well fuck you. I don't want you either".

I start ruminating about what I may have done wrong. I'm not even talking about romantic relationships. I've lost multiple friends after cancelled plans because surely them not coming to dinner means they hate me. I usually end up pushing the issue, demanding answers and dramatically running away first before they can.

I can feel I'm close to the edge at work. It's a great opportunity but I'm scared I'll ruin it. I'm working my buns off but I'm starting to feel unwanted and undervalued. The owner of the company is a family friend who literally said "you're way over qualified - I'd love to have you!" Now, I'm questioning if I was hired by mistake or at the very least if my boss regrets his offer. I have to almost beg to be assigned tasks. When the less experienced intern was offered a coveted project this morning, I started feeling the ole RSD flare up again. Today I felt sad, but what happens when I'm a disappointment or ignored and I feel the need to put people in their place?

"You don't value what I contribute to this company? Well fuck you and fuck this job".