Nah it's not rattling or anything like that,

It's coming from the engine bay for sure.
It doesn't do it when I just rev it in neutral,
But when I'm driving it just makes a strange noise?
When whole tone of the exhaust changes and all.

This is my first car and i just don't want to look like
an idiot if I go pick up my mates and it blows up and we are all stranded.

Cheers for the fast reply!