They are being normal hamsters. Their isn't much you can do, I never had a friendly one my whole life, so I changed to mice and larger rodents. The best thing I can offer is wearing a glove when you pick them up, and only mess with them in the evening. They are night time animals, so you are really waking them up during the day.
I'm no expert, but I would suggest giving your new pet a few days to a week to adjust. Then you should slowly let it get used to you by being around a certain time every day and then work your way up to handling it. You can also try treats. My hamster loved being in her "rollerball." She was more than happy to be picked up if it meant rolling all over the house.
You need to be patient with hamsters -in the beginning let them get use to their new environment for a couple days keep talking to them and let them hear the sound of your voice . then for the next couple of days leave your hand near them to get your scent,never grab them . you will get them use to you by gently picking them up dont squeeze! but hold firmly for just a bit put them back with practice he/she will get to know you and feel safe. clean the pee corner it chooses about every other day(hamsters like to be clean) leave their nest they build alone and only change the whole house when it starts to stink) If a hamster stands on its hind legs feet out and mouth open -its frightened if it screams its petrified and your introduction must be slower. try had feeding it a sunflower seed(its their favorite) or a small peice of lettuce or carrot, read up on what they can eat(somethings are harmfull) always have some kind of chew stick for them to grind down their teeth or that could become a problem(the chew sticks are sold very cheaply in the pet store come in colors) just remember they are young,frightened , be patient move slowly and dont sqeeze or drop. you will eventually have the cutest entertaining cuddliest pet.