Why do I cry when I see others crying?

I cry when I see others crying. Even if it's obviously fake crying, tears roll down my cheeks. I watched a weird Buzzfeed video on what people look like when they cried, and I cried. I was looking at that tik tok half face challenge (people making themselves cry on only half the face), and I couldn't hold in the tears. Today I thought about throwing a ball for my dog for the last time, and I bawled. It's like I cannot hold the tears back. Am I just a very emotional person? Can any people that have knowledge on why I am like this explain it to me? I know it sounds like a dumb question, but no one I know is like this. I'm just curious.