[michaelochurch]

It's easier to tell "time to leave" from "the whole thing has failed". It really sounds like the first is true for you. The second? Quite likely, because a lot of startups fail, but the definitive "it is over" moment might come loooooong after (like, 5+ years after) the point where you, personally, should leave. Your rich co-founder can keep it afloat-enough to say he has a job for years, but this does nothing for you.

My partner is fine actually, he has rich parents and doesn't really depend on the startup for income.

Sadly, this also means that he outranks you. It couldn't be an equal partnership even if he wanted it that way. He has the connections to find clients and funding (although it sounds like the latter is out of the question) and you don't, which means he'll call the shots.

If you're going without salary and not the boss, it's time to leave. Time to leave was a lot time ago, in fact.

I'm 25, I feel like I'm losing at life already.

You're not. 25 is not old. You're losing money and opportunity every time you work at a dead-end startup, but that's not the same thing as "losing at life". Just make the best decision you can at this point. You don't have to justify your past or yourself. You tried something and it didn't work out; that happens to the best of us.