mjhjmtu

Don't judge too hard.

It took me about a minute to make up these bad rhymes for a very silly riddle.

It is really silly =) I'll try better next time.

UPDATE

I added a little hint to the rhymes

I can be old, I can be new,

I can be false, I can be true,

On camping trips I visit you,

Near the fireplace at night,

The time for me is usually right.

Now who am I or what am I?

The answer is for you to find.

Similar to Jannis' answer, are you a:

Scary story?

As

There are classics, there are new ones, most are made-up monster tales, some are real-life unexplained mysteries, and they're often told around campfires late at night

Are you a

Campfire song?

This is pretty obvious, so i think it's wrong

Because:

true, false, old and new are attributes a song can hold

and it's usually played on camping trips at nights near the fireplace

Are you

a friend?

I can be old, I can be new,

Old friends and new friends

I can be false, I can be true,

False friends and true friends

On camping trips I visit you,

Trips generally spent with friends and family

Near the fireplace at night,

The time for me is usually right.

People gather around a fire and make friends.

Are you

A joke

As people say they are old, new, right or wrong.
And also tend to say it's always a good time for one.