Domino Effect?

I hate when I let other peoples moods effect my own. If one person that I'm hanging out with is sad then I'll be upset. Like right now Dylans upset about god only knows what, which has me upset, which then makes me think of all the things that upsets me and it then induces my anxiety. I hate that one or two people can have the much of an effect on me. Am I that weak and narrow minded? I'm sure like most thing this too will pass but for now I will sit here in my silent depression caused by the sorrows of only one person.