Beside having wings, you need to have some very powerful muscles to operate them. Birds have very large chest muscles called pectorals which are used to flap the wings. When we eat a chicken filet sandwich, we are actually eating the pectorals. Besides having powerful muscles, birds have several neat tricks to make them lighter. Powerful jaws and teeth are very heavy, so birds have beaks instead.
Mammal bones are very heavy, so a bird's bones are nearly hollow to reduce weight.
Finally, birds lay eggs instead of giving birth to live birds. It would look pretty silly. If you had all the characteristics of a bird like wings and feathers, large muscles, and light-weight bones then maybe you could fly. But of course you wouldn't be human anymore, you'd be a bird.