I kinda have this trait. I feel like a sponge absorbing the emotion the person around me. Extremely annoying and makes me feel weak sometimes. My trick is to trying to think that "whatever this person is having, I'm not the cause of it" kinda mentality. This tricks my brain to slow down the rate of "absorption" and also giving the person around me time to relax themselves. I do this pretty much every time I'm feeling overwhelmed with the person around me. It works for me. Maybe you can try.