how do i stop my iPhone iTunes from Shuffling songs?

In the Music app, tap the screen to bring up an extra menu bar showing the current song's timeline. In the lower right is a pair of crossed arrows -- when enabled (blue), shuffle is on, tap it to turn shuffle off (gray).

Edited to add: That's when you've got the album cover image up, if you're on the track listing, tap the upper-right corner to bring it back to cover art view. The other two indicators/buttons on the bottom of the same bar are "repeat" (bottom left) to repeat the current track or playlist (two options), and "genius" (bottom center) to generate playlists of songs similar to the one currently playing.