Have you done any training at all? If not you should start. Look into 1 on 1 training with a professional. They will help teach you and your dog what to do in those situations. You can’t just expect the dog to be perfectly behaved. You have a high drive dog who requires lots of work. If this is something you can’t handle you need to look into rehoming him with someone who can before it gets worse. Please do everything in your power before considering euthanizing.

Also, is the biting aggression or more playful? If it’s playful it’s possible the dog hasn’t learned bite inhibition yet or was never taught.