That's because 'lads' are usually immature jerks (my opinion only). They are usually the kind of guy who tries to put on this kind of masculinity that comes off fake and agressive/predatory to try and show off to their mates/to girls instead of just being themselves (also my opinion).
Apart from that, as a girl, I don't really know how to give advice on this, I'd say just be yourself - it's the most attractive thing in a man anyway.