Aggressive Labradoodle 4yrs old

I have a dog, I brought him when he was 5 months from a pet shop. Was always an excitable dog, loved people, anyone and didn't really bark at anything. I trusted him with anyone.

I took him for a walk one day and he jumped at a lady when I was walking him and nipped her when he was about 1 year. I thought it was random but was a little nervous after that when walking him.

He got worse and worse until now I dont walk him cause I'm too scared. I have brought in dog whispers and he was fine, not agressive and just barked at other dogs.

I got another dog which was from a kennel and she ended up really agressive and my labradoodle got worse. We had to give up the second dog we had because they just kept fighting with each other and hurting each other.

I took both of the dogs to a dog training centre in penrith but kept getting told to take them for a walk or stay at the end of the line with the dogs because they barked too much.

I took the labradoodle to the sydney dog school and they said he was fine, a little highly strung but they could control him fine and he was good with the animals and children there.

I have not had a lot of time with him lately because of my hours, but want to get back into training him but he has gotten worse, he is even agressively barking at my friends he used to like now.

I dont trust him with anyone apart from me and my mum and aunty... and get really scared when anyone else comes around. I know his behaviour is my fault but I want to fix it but dont know how.

He listens to all my instructions when no one else is around and im proud of his obedience but when others or animals are around he is so unbelieveabley naughty.

I really need not only him trained but myself trained I think and I need to trust him again but I only think that could happen if we are trained together and I actually see his progression with people and other dogs.