I always lied about my birthday wishes when I was younger.
Did you have a reason for it?
It was just for fun, and I started to like lying about stuff.
It's okay to tell white lies from time to time, or to keep our real desires secret. However, it is wrong to deceive people about important matters. If you are still feeling a compulsion to lie in adulthood, you should talk to someone who can help.
Well I don't see anything wrong with it.
In this specific case, when you were just lying about birthday wishes, then I do agree with you that there was nothing wrong with lying for fun, since no one was truly deceived or hurt.  However, now that we are adults, our lies can have terrible consequences.  I hope you recognize that you should not lie about important issues.