I tried getting a dog to solve the same issue. It did not work out so well. If you can put up with all the whining, barking, vet visits, 3 months of basically chasing around a pooping, peeing toddler, then go for it. It is not as simple as being the "pack leader".

Getting a dog is likely not going to solve your problems and you should fully investigate the myriad negative consequences of getting a dog, including robbing you of your freedom. Also, if you don't live in a house where the dog has free access to a backyard I strongly recommend against it.

Your are going to need to socialize it as a puppy. Going out on walks at 5 am does not sound like a good socialization opportunity. And what is the dog going to do while you're at school?