I am in my first year of teaching as well. I constantly feel like I am struggling to keep my head above water. However, I know it is going to get better. Most teachers that you talk with tell you the first year is difficult. No matter how much you read or observe or students teach, there is no preparation equivalent to being in your own classroom.
I teach seventh, ninth, tenth, and eleventh grade. Students are sometimes disrespectful and flat out mean; however, you have to remember that you may the teacher that changes that for them.
Do not give up! You went into teaching for a reason.