Why do I feel numb all the time? I'm constantly faking my emotions during interactions with people so they don't think im a bad person. I only feel very short term extreme emotions but very rarely.

This sounds like the result of severe or prolonged depression. This could also be a result of trauma or some sort of abuse, especially something ongoing. It also sounds like Anti-social Personality Disorder, although I see this as less likely than this being a result of depression because this disorder means a lack of empathy and not a lack of overall emotions. Depression definitely includes the symptom described much better. I am not a professional but I have a decent knowledge in this field. I hope my insight is helpful, although without more background information it is difficult to pinpoint the exact cause.