How bad is it to pop my pimples?

Popping pimples can lead to scarring or an even worse pimple, because the bacteria on your hands and the action of squeezing your pimple can push bacteria further into the skin. If your acne is becoming severe, you should contact a dermatologist, who may be able to prescribe topical solutions or medications for you to reduce your breakouts.
For more information on how to take care of your skin:
https://www.aad.org/public/diseases/acne-and-rosacea/pimple-popping-why-only-a-dermatologist-should-do-it