You can reset your password.
Your login information is your player name + your password.
So it should not be that hard.
If for some reason that ain't possible because you did not use a correct confirmed e-mailadres, or lost access to it you can always contact support.
But you will need to proof without a doubt that you are the owner of that account,
The only way I know you can do that is if you bought someting in game, and you can show that with like a screenshot from your bank account.
They can compare that with there own payment information and therefore proof you are the true owner.
If you can do neither, if you never bought anything, then you're out of luck.