[jazzyk]

Words can break hearts when they come from a loved one, or someone you look up to.

Why would what some random person says break your heart?

[solveit]

Because you're fourteen, those randos are your peer group, and you're stuck with them all day. Also, you're fourteen so you haven't quite figured out whose opinions should be important to you, and also you're wildly insecure about your position in your world.

[jazzyk]

Life is not fair and not a bed of roses, never will be.

These experiences make you tougher - in adult life, you will run into toxic bosses, colleagues, brutal job interviewers...

It is important to have a loving family and/or supportive friends who can provide a different point of reference.

[wodenokoto]

It’s just a funny twist on a well known saying.

I think you are taking “heart” too narrowly.

School and work place bullying can definitely hurt you even if it is “just words”.