There is no need to apologize for how you feel. It's normal to have good and bad days. It's all part of the grieving process. You are grieving the loss of friendship and companionship. Feel the pain and then release it.
This is your time to venture out into the world and either meet up w/your old friends or even make new ones. Nothing says you have to sit there and tell them every detail. In fact, it's better not to say much to them at all about the situation. If you have one really good friend that you can lean on, this person would be the one that I would have those talks with.
Pamper yourself a bit, even if it is only doing your hair or a bubble bath...but you need to be kind to yourself and understand that you won't get over this today or tomorrow because it takes a while to do so.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
