feeling crazy

my boys are graduating next month and im getting really down. like i suck at being a mom, i messed up their lives blah blah blah. should have given them so much more. they are so introverted and identical twins that are glued to the hip and they are going to separate colleges and i think its scaring shit outta me. im sad and want to stop the clock. feel like im loosing it. just overwhelmed with everything. trying not to beat myself up. had question does anyone one else dig at themselves. i keep picking at cuts bites anything until they are big scars. not sure how to stop this. i know its nerves...need friends but when they dont need me i freak out. its too much for me and i worry so damn much. i hate being me today.