My friend, I hate to tell you, but that's just not true. We are incredibly at the whims of everyone else to even get too and from work or school each day. We only have running water, electricity, food in the fridge, etc., because we all depend on each other.
Don't mistake being independant with being self-sufficent. Don't mistake requiring the support of others for requiring the support of any one, specific person. Every single one of us is dependant on many of us, but none of us should plan on being dependant on any one specific person for our entire life. And that's okay. This is how society functions, and life is a lot better for it.
Though I am sorry for whatever happened today to leave you feeling that jaded. Some individuals really just aren't worth it. It sucks when we think they are, and find out the hard way.