I've been lying about my age to all my closest friends in real life since I was 11 years old.
Why did you start lying about your age?
Because I was bullied badly by someone.
Now that you're older, you should probably stop lying about your age. You'll feel better about yourself. I can't imagine you enjoy lying to your friends.
I still enjoy lying about it though.
Lying is not cool, people are going to see through it. You should not use your childhood trauma as an excuse to lie to people. There's always a good reason to lie but there's always a better reason not to lie.