The turmoil that is felt by victor due to what he considers a mistake is a reflection of how he feels about himself. The monster is not necessarily just a monster but a reflection of himself. By creating this being he is giving birth to something new that he hopes will make him proud, which is how he feels at first. Once the monster became something he saw as ugly and evil he shunned it and refused to acknowledge its existence. He in turn is really just disappointed and appalled at what he himself has become. The idea that he can turn away the monster so easily shows that Victor is a very emotionally disturbed man. He knew internally that he was creating this monster so that society would see him in a brighter light. It was all just a show to make him famous in the eyes of his peers. By giving this creature the appearance of how he feels inside I believe he was trying to eliminate those feelings. Throughout the novel Victor attempts to hide who he is as a person, yet after careful examination you can see right through his disguise. The monster attempts to better himself throughout all of this even though he is generally seen as an abomination. If Victor had never abandoned him like he abandoned his feelings then the monster would have been a success. This shows that everything is inherently good, and as long as you nurture the goodness in someone their appearance will just become an after thought.
