First of all, a word of warning: it's not going to be a bed of roses. The road from break-up to recovery can seem long and stony, so be prepared for some difficult times ahead. Keep telling yourself that when you get through it you'll know yourself better and you'll be stronger.
It might be a good idea to remind your family and friends what's going on in your life (if they don't already know) so that they understand if you're not your usual self and don't think you're being off with them. See the different stages of a break-up