I accidentally put too much oil in. Now the engine keeps shaking then shuts off. Did I ruin the engine?

It is unlikely that you have ruined the engine by adding too much oil. However, it is important to check your owner's manual to see your vehicle's recommended oil level. If the oil level is too high, it can cause the engine to overheat or seize up. You should also change the oil as soon as possible to prevent any damage.