Why would anyting be different?
Adapting is normal human behaviour. Most of our behaviours are based on our environments. For example, if you are a loner and if you are a journalist, you'd be forced to be verbose lest you want to lose your job. After you somehow forced yourself to be verbose during work and got comfortable with it, it means that you have adapted.
At this point I changed nothing.
Keeping the above example in mind, if you do manage to become verbose, it is going to have a long lasting effect on your personality because your social confidence has permanently increased. Secondly, it opens up various branches to your reactions which you may use in the future.
But tried many others to adapt....
Adaptation can also work negatively. A person can negatively adapt in the form of developing behaviours that go contrary to the situation. But this lies on the surface. To be more accurate about this, we have to understand that a person is forced to respond to his surroundings. If he is able to not stagnate then they say, "He's adaptable." and if not, the person is deemed as inflexible. However, this inflexible person may now 'complain more.' or has become 'whinier' or does not seem to 'care at all.' On a psychological level, the person manages to rid the distress of not being 'accepted' into such behaviours.