hi my 18 week old puppy keeps barking at everyone when i take her out if people talk to her or stroke her she loves the attention ive tried taking a toy out and treats but nothings changed it is getting really embarrassing and i get some right filfy looks because she is a gsd please help

Do you take her to puppy/training socialisation classes? These are a must for every dog. You will find that once she is mixing with people and dogs on a regular basis this behaviour will calm down :)

Remember, you can never over socialise a GSD or any dog for that matter ;)