I regret getting a puppy and I don't know what to do.

I would strongly agree with the other posters who suggested you think long and hard about this. In fact, my advice would be to find it a good home, other than yours. It does not sound like you are prepared to really give this dog all the attention and training he needs. A Rotty is a big responsibility, when he gets older, if he is not disciplined and trained well, he may be too much for you to handle.

I hate to see dogs given up because their owners went into it thinking owning a dog would be like owning a teddy bear or cat. DOGS TAKE WORK. A lot of it, especially when they are pups. They need consistency, exercise and companionship. They are pack animals they need companionship as much as most people. If you are not going to be around much, give this dog a chance to have a home where he will get the attention he needs. Please, think about the dog and not yourself.