What stops Poker from being “Big bank take little bank?”

Sorry in advance if this seems like a dumb question, - I’m new to poker & only know some of the basics.

Let’s say hypothetically you had the best possible hand, but only a limited amount of money. Let’s say your opponent has a super bad hand but unlimited money and (s)he bluffs and raises the pot higher than the amount of money you have. Would you just lose because you can’t afford the raise? Even though your hand is amazing?

Thanks in advance to the answers.