"I think my co-founders are idiots, that they fouled up their side of the deal, but I feel as though I've invested too much time and energy to bail now."

This is the feeling! I remember this.

Let me be extremely clear here: forget about your time investment. It does not matter. If you don't believe in the company and especially in your business partners, leave NOW. Each day you stay is delaying the next big step in your life that will get you to a better place and a happier life.

I've been there. Did it for years with the wrong partner because I didn't trust my gut and leave early on. I should have. I left after 5 years, abandoned all that work, and I've never made a better decision in my life.

Startups are hard, and they do have their ups and downs, but that is not how a startup is supposed to feel. Get out now.