Working on the first irrational belief:

being respected rather than being loved by everyone

As teachers, students should want what we have, and we shall try to be good examples for them having a good character, as everyone respects and admires exemplar profesors, despite they might not like you. And that is where I should direct myself, to find the right balance and be more confidents. Very often, how you look is crucial when it comes to teaching; how you walk, look, stand, dress, act, speak, respond, etc. If you seem that you respect yourself, they will get the message at the first sight.

You need to be very constant with what you say so the words used are not lightweight, without influence and have lack of authority. A good teacher is someone who is dependable and friendly at the same time, it does not work when one day you are shouting at them and the next day you are the loveliest person, because they get lost and do not respect as a result. In order to gain their consideration, and refrain resentful and enraged attitudes, it is a must to give a wide berth to your emotions when responding to undesirable behaviours. Every time a rule has been broken several times you can change the consequence and let the rules of your classroom do the job, while you keep your meaningful relationship with your students.

“Respect is earmed through the honor of your word, the steadiness of your temperament, and the gentle quiet strength of your convictions” (John Martin – educator)

It is very important to invest your time on classroom management methodologies, and see which one applies to you best and try if it works. 

Cognitive distortion applied to this situation is OVER-GENERALIZATION

On that they I felt that everyone was disrespecting me and I thought that if I had a chance to give them another lesson in the future its was going to be exactly the same. So basically, just because three or four were not fully focused on what I was saying, I took as the entire class was being unrespectful and I had that horrible feeling deep inside me.

Over-generalizing can be seriously damaging when:

• We have faith in those conclusion that we have made and we take decisions in life basing on this "facts" that we think exist.
• We limit our beliefs because of the overgeneralization and we therefore do not keep going forward because we have created this belief that we cannot do it, when we are actually capable.
• Artificial barriers are created within our mind.

The best way to overcome the fears and misbeliefs that we believe exist, is to start paying conscious attention to what we are thinking and analysing the ideas as objective as possible.
When an idea comes up to our mind it is vital to question its validity straight away and think of  what supports that idea. You can ask yourself:

1. How true is this belief?
2. Where are the proves? 
3. Are they significant enough?

Keep yourself being aware of all those thoughts and take action so you can see if those thoughts persist or it was just a misbelief or a fear. Eventually, wherever you were seeing mistakes you may end up seeing them as opportunities to learn and improve in life.