Correct. But OP can do both:
1. Contact the admins via PM to ask for account deletion, providing a reason. (Perhaps they will delete it, perhaps not).
2. Meanwhile, OP can forget about the account and continue with their life like bitcointalk doesn't exist.
I don't think that admins have time to check everyone's PM's and that's why sending a PM to an admin won't be helpful. If I'm not wrong then admins might have disabled receiving PM's from newbie rank members thus it won't be possible for him to send any PM to admins.
So I guess the 2nd option is going to work for the OP. He should forget about the account and change his e-mail addresses so he will believe that he's no longer present on Bitcointalk and then he can continue to do whatever he likes in his life.