Welcome to RAD mate.
You are a lanky fooker so need a bike with a long top tube! Are you looking for an old school bike or a new one to ride?
Most new BMX's have at least a 21" top tube which is more suited to someone your height although I would go 21.5 or 21.75. Most old school stuff will feel very short for you now...it really will feel like a kids bike!