My life is getting intense and I feel like I'm going insane

I'm 23 y/o (m) with a 20 y/o girlfriend, a 1 month old baby, and a 7 month old cat. I'm a veteran, spent nine months in Afghanistan and recently got out in 2015. I met my girlfriend in 2016 and we found out she was pregnant about 6 months later. Now the baby is here and I don't know how im gonna do it. I literally feel like im going insane, like I was already a little off when i came back from the military but this is a new level. I absolutely hate my job, i work about 30-35 hours a week at a gas station in a bad neighborhood, the rate is $10/hr but that really doesnt matter since I get most of my income through my GI Bill. The only reason im still at that job is because they're so flexible with their schedules that is benefits me while i go to school. Money isn't the issue, we live comfortably. The issue is me working 30+hours/week + going to school full time + having all these people that need me constantly 24/7. Like i cant catch a break, if the baby isnt crying, the cats meowing for attention (if not both), if they arent saying anything my Gf just nags at me that I don't spend enough time with her (all my time not spent at work or school goes to her and the baby). I just want to know how people handle it, constantly moving from one thing to the other. I usually get an opportunity to sneak away to the gym around 10pm every night and while I should be using that time to sleep (baby usually keeps us up all night) i feel like its the only thing keeping me sane. Any advise would help. via /r/Parenting http://ift.tt/2pa3aC4