Is it normal i allow my self to become attached to animals, not people?

I really don't understand why I can't find people that actually want me in their life. I hear the words like they say things that imply those feelings but I don't see the actions to match. I'm always the one making the effort in friendships. Recently I've been trying to get to know a person because she seems awesome! She never talks to me first or asks to hang- Its always me! I look at pics on Facebook of people from my old school way back (age 15-18, im 21 now) that are still best friends with there small circle of close friends. I ask my self, why cant I have that! It hurts a lot that I'm over people not trying, despite getting along extremely well and thinking they really like me. I now have made my pets my priority because its never mutual when I like someone and try establish a friendship . IIN?