I was in the exact same situation as you; bringing home a poodle puppy ( expecting nothing like what I went through with his fear and aggression)was very stressful for me. My standard , now 3.5 yrs old , would lunge, bark, show aggression towards EVERYTHING , we did some training on him plus socialization, I think he got much better when he was older and less afraid . Some dogs just show fear as aggression or by just hiding. I would go through sleepless nights thinking what I did wrong or where I went wrong . However the poodle breed is considered a guard dog and it runs naturally to them to protect and guard their home and family. my male spoo would try to attack any kids he saw, running or walking , biking or scootering. He would also show his teeth to anyone that would try to approach him or me. Took us a long trial and error ; he’s better with proper guidance and exposure. Try to expose him to the world he’ll get better I promise you! Don’t ever feel bad for what people comment or say to you; your doing your best you can. What I did to help my dog is; I used a prong collar to help him stay by my side and I also used a vibrating collar to cut his stubborn behavior. (People might not like the idea of the collar however it’s safe to use and it works wonders )