How to love those who are hard to love?

Elizabeth
I'm really struggling to be a good Christian when it comes to those who are hard to love. I know loving everyone is most important. But when people who walk over others, lie, minipulate,cause problems for others who are innocent. I can't stand that it makes me so mad and highly dislike alot of the human race. How to you learn to love people who may not deserve it because it's what we should do as Christians? Any Christian ladies on here who can offer some advice?