I learned about the equilibrium constant. Now, I've seen that the equilibrium constant of burning is extremely small $(K \ll 1)$. here, I have a question. you see, $K$ is still NOT 0, which means that the forward reactions happen at least a tiny bit. Then, shouldn't we see some parts of anything burning at least a little bit?
Why is it that when I use a lighter, for instance, that things don't catch fire spontaneously all around me? Shouldn't the equilibrium constant $K$ for the carbon combustion be big enough for that to occur? I was told that I could calculate the amount of fuel needed for a car engine, assuming that everything burns completely and at constant pressure, knowing $H$ (enthalpy of combustion) and $K$ and by
why don't we see anything burning continuously? I know this question might be stupid, but I really want to know.

You are correct that the equilibrium constant for the combustion reaction is very small, typically in the range of $10^{-14}$ to $10^{-30}$ depending on the specific reaction. This means that at room temperature and atmospheric pressure, the forward reaction (where reactants are converted to products) is many orders of magnitude slower