In the Garden of Eden, God said, "It's not good for man to be alone." The Apostle Paul writes in 1 Corinthians 12 that God gives each of us certain gifts for "the common good." God created us to need other people. He requires us to rely on others, and others to rely on us. Since we must have other people in our lives, we may as well have better relationships. If you want better relationships, here are a few things you can do.
First, since we are part of the relationship, we need to be the type of friend others would like to have. I think the best word to sum up what we need to be is "faithful." In Luke 16:10, Jesus says, “Whoever can be trusted with very little can also be trusted with much, and whoever is dishonest with very little will also be dishonest with much." We need to be a friend others can count on. If you say you will do something, do it. If they ask you to be somewhere at a certain time, be there. Work hard at being reliable.
Next, be honest. "Faithful are the wounds of a friend; but the kisses of an enemy are deceitful." (Proverbs 27:6) True friends will speak hard truths. Just be careful to do it with love. We appreciate when others deal honestly with us, so do that for them.
Finally, we can change our behavior, but we can't change other people. You can't choose your family or co-workers, but you can choose your friends. The Bible warns us that, "bad company corrupts good character," so be very careful with whom you associate. If friends build you up, they're probably ok. If they constantly drain you or cause you trouble, it's time to reconsider those relationships.
Work hard at building better relationships, and your life will improve!