We are choosy and always make friendship with those who have some similarities with our nature. Everybody is unique and possess various characteristic. It's our characteristic to find the comfort zone and that's why we make so many choices.
There are people who possess different characteristics but remain good friends throughout the life. For them, often we refer to the example of the magnet - opposite poles attract and like poles repel. They have a very good understanding of their differences.
But in general, we choose the company of like minded persons. Sharing our feelings and chatting with the other person is the inherent aspect of any companionship and things can be shared with another person only when we can exchange our views. For example, when we are eating together and sharing the foods, the non-vegetarian items cannot be shared with a person who is a complete vegetarian. Though both the persons can have a very good friendship. Actually, it is impossible to find another person who is having exactly the same characteristic. There will be dissimilarities, but for being a good companion the mutual understanding is a must.
Ultimately we cannot live alone and need a company to talk to and share our feelings. Therefore it's our tendency to choose the right ones with whom we feel comfortable.
"Life is easier when you enjoy what you do"