Tbh, I don't think blonde would suit you. Like parry said, you'll look a bit 'washed out'.
People can sometimes look better with a hair colour that is not their natural one, but you should not go all the way to the opposite. I'm naturally a blonde and I know I would never suit your hair colour.
If you want a change, or something a bit 'softer' and less gothic, you're better off going for a medium brown and then add highlights of several beige tones.
You'll have to go to a very good hairdresser and have them use many colours (for the best result) and it will most likely be very expensive but I think you'll look great with it.