What is your sleep schedule like? Anyone can be awake and eat, train, work, lift, and learn for 20 hrs a day. But your doing more damage then good. On days you lift, that night try to get at least 8hrs sleep. Your body heals while its sleep, faster then when your awake.
But as for doing it on your own...there are always people in the gym, find someone you see regularly and make a friend. I hate going to the gym by myself. I need someone to push me and to compeate against. So its rellay hard for me to push myself the way I would if someone else was there with me. But if its safety your woried about...then yes two is always safer...but like I said the gym is never empty.