It is normal to see black bars on top and bottom, it is because of aspect ratio movie was made to.
Wide screen TV is 16:9 (1.78), most movies are made in ratio other than that, up to 2.35. Any movie with different ratio than 1.78 will have black bars on top and bottom, viewed on wide screen TV.
With 4:3 (regular) TV is little different and all depend on your DVD player set up and if DVD is set as Pan and Scan or Letterbox.
To your other question “DVD look like I bought it”, that is impossible, unless you give it to a production house to press it for you instead of burn it, like you will do.