The speaker is hurting because someone has dismissed their pain. The person said that what the speaker has been through isn't bad enough to justify feeling depressed. The speaker pushes back, and the anger is easy to hear. They doubt the other person's own life story, calling it probably a lie, then quickly admit it might be true and say it wouldn't change anything. Nobody gets to decide whether someone else's suffering is valid.
The poem is short and blunt, and that suits it. The lines read like someone finally saying what they've held in, without polishing it. The title, "Wow," sets the tone: a stunned, bitter reaction to being brushed aside. The last line, "Few actually do," is the quietest and saddest. It suggests the speaker keeps their story private and feels unseen, so being judged by someone who doesn't know it stings even more. The mood is defensive, hurt, and a little lonely.