[Retric]

There is exactly one person in the house you vote for. So, rather than 535 nobodies, it's 3 people (1 house, 2 senate) you should pay attention to. At a minimum you should be able to name your congressional representatives and something about them. But, realizing people in the house have very small margins in absolute terms should embolden you as shifting 1,000 voters can swap many elections and most even vaguely competitive races are less than 10,000.

PS: Sure, if someone really annoys you then make a note to donate 20$ and to their competitor in either primary or general election depending on your party of choice.