The real question here is "how?" Am I not friends with my friends? ..
The act of being a friend is totally different from just being close to someone. When you are a friend, you have a true and definite and sincere affection towards a person.. it doesn't matter if they are friends to you, the most important thing is that you are friends with them and that can go a long way in your own growth and mental health.
Having deep affection for your friends doesn't really mean you will have to be inlove with them or in a romantic relationship with them but it really means being there and accessible to those whom you really want to be friends with, and those whom you have chosen to care deeply for. Having a friend can be tasking but it doesn't just help them but it helps us more and it can relief us of our own mental stress and health and it can also build great and cherishable memories and it is also worthwhile.
Be a real friend and it would come back to you!!!