To have a friend, you have to first be a friend. Don't wait for your friends to call you, call them first. Don't wait for your friends to plan an outing, plan one yourself and invite them. If they are busy, don't feel rejected, call someone else. People do get busy. Don't talk about yourself all of the time. Ask them how they are doing. Ask them about their hobbies. Having friends takes a lot of energy, something we don't have. So we have to plan ahead to do something during a less stressful time and save up our energy for that. Good luck.