For what exactly? For your crush??
You could take deep breaths and attempt to solve the problem yourself. You could also talk to someone who has dealt with similar problems in which they can help you solve your's. If that doesn't work, you could talk to your doctor about your stress so that he could prescribe you with a medication or a healthy lifestyle to help you with your stress.
It's basically a characteristic of bacteria that have a cell wall composed of a thin layer of particular substance (called peptidoglycan).
Is false I don't believe this is true