Not Understood

I'm having a rough time right now. It seems so stupid, but when people move their feet it upsets me to the point where my stomach hurts. My sister knows this, yet she purposely moved her feet and taunted me while everyone else in the room filmed and laughed at me. I have been crying for like an hour, and my dad came to talk to me, but yet he is clueless. I feel like no one understands me.