Your parents and relatives are your first friends; you don't have other option neither. Still, they are really important in your social and personal life. Moreover, they are gonna be like that forever. So, you have to get use to it. However, what about your other friends? Do you feel that you have real friends or just acquaintances? Do you think that friends are circumstantial only? Do you believe in truly friendship between a woman and a man without involve any romantic or sexual aspect? What do you think friendship is? Would you be friend of someone that doesn't help you? Does friendship has to be mutual? Is friendship really for free or you have to pay in some way for it?
It seems that every relationship, including friendships, need to have two cooperatives parts. Perhaps a truly friend would be willing to help you at any time if you are willing to help him or her. After all you're friends, you support each other always, don't you? A good friend always make you feel good or listen to your problems without judging; and even when you loose contact with them, or your relationship is not the same, you'll always remember them with happiness; all the things you two did together, besides all that learning, no matter what happens, it's gonna be with you forever... Beautiful isn't it?
Matthew 4:55 Love your enemies and pray for those who persecute you, so that you may be sons of your Father who is in heaven; for He causes His sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous.
That doesn't mean that make friends is a egotistic thing; perhaps it's just an agreement of mutual support between similar people helping each other (without any contract terms). Anyway, having friends is a responsibility, whether we like it or not. We need to be there for them and do everything we can without any excuse. We have to be happy to help always!
On the contrary, you can help your "enemies" without being their friends, you can spread love to everyone without feeling responsible of anything. It's a free way to help others without even knowing them. An you know what? you don't need to expect that they help you in the future, but perhaps they'll do it anyway. I guess that's something we can't change about our specie.