Hello and welcome to the forums.
When I got Rusty as a puppy, I thought he was "aggressive" as well. He would growl, lunge and bite my hands. Those puppy teeth are very sharp, and I got a lot of cuts. I found out, that Rusty was being a normal puppy, and it made me feel better.
I had to start training him, and it took some time before he was easier to control. Now, Rusty is a sweet heart and I learned a lot from the puppy stage. You need to get into a good training class, and it will teach you a lot, and train your young pup at the same time.
One thing, try to exercise the puppy so you can use up all that energy the dog has. It can be a challenge, but you will have an amazing dog one day.
Thinking of aggressive puppies. My current Pomeranian puppy has been a huge challenge. He has shown a lot of aggressive behavior, where he would bite us and attack our hands. After training, and working with Teddy Bear. He has become a much better little pup, and I'm glad we did not get rid of him haha
We thought Teddy Bear was "aggressive", and with the help of a trainer giving us good information really helped us out. Rusty was a challenge at first, but Teddy Bear has been the most challenging puppy to date. He would flat out attack us, and I have never exp that type of behavior before. All it took was time, and training the dog to change these bad habits.
Hang in there, and everything will work out for you. Puppies are not really aggressive by default, because that comes from abuse or other factors to make a dog fearful/aggressive etc. Your pup is being a normal puppy from the sounds of it, but you need to start training asap (if you have not already).