Probably the most important comment in the thread.
You're being taken advantage of. This can't be overstated enough. And if you really insist on letting it happen, you must check that your payoff is going to be what you expect. Make sure your equity won't get diluted too much, make sure your equity can't be taken away from you, and make sure that in a liquidity event you're in a proper position to receive payout. Some liquidity events result in no money going to certain kinds of equity holders due to payment priority.
quit and recuperate and find a real job or a real co-founding team.
if you insist on going through with it, have a lawyer verify all the company paperwork.
good luck.