How I Do What I think I cann't do? #Explained

What is this, how is it possible that in some situations I think I cann't do and I do it, what is the factor of motivation what is the thing that is bigger than my thought? 

There are two main factors of it, which works great in my Life:

1) Watch your mind while its going negative and asks question.

2) Take action, and watch the worst side of your action but still take action, because I never got to worse and everywhere I reached was better. 

    Let me give you a example to relate:
I used to play chess regularly, but I never participated a city tournament. I have got to know that there is tournament after few days, and I knew that If I will go there I will definately loose. But because I was playing a lot of chess, I participated in it. I was very nervous when I saw lot of people playing chess and a busy enviornment. I got very nervous. That I cann't speak genuine. My  friends were with me and I couldn't understand what to do. This was the First tournament day and my game confidence was zero. But,though my game was good, so I won the First 2 matches of the tournament because the players spoke to me and told me they were beginners and just participated for time pass. 

 But the tragedy starts now, when little bit good players started playing. I was very much nervous while playing, and due to nervousness I played lot of bad moves. But still I won because I was my ability was more than my opponents. So I won four matches and I have to win the final match. Now, I was little bit confident to play this battle. 

    But Before playing I was warned a lot, that you are going to play with the opponent, who doesn't loosed from 5 years in this tournament. He is lot of egoistic so defeat him, his whole family is egoistic. Defeat him somehow, and that player also taunted me, that how you reached Final, I cann't believe you don't even know how to arrange pieces? I was nervous and I didn't spoke a word. After sometime we started playing I was like, I have to do draw somehow. I played very nervously and gave my match and I won that match. This was the great feeling, everyone was appretiating me, asking my name because I was a new player. and I defeated a player who didn't losed any battle from 5 years. 

   Here, its clear that mind didn't know brains power and can do what mind didn't even imagined. These example doesn't show my above factors because I started follow it before few months and I sure it works great. 

 Let me give you one more example:

I didn't gave any speech in my entire life, but in college days I got a opportunity to give a speech. and I was very nervous because I was also having stage fright. I never listened my voice in mike. But I somehow raised my hand when sir asked class,"Who will give speech?" 

But Somehow I prepared to give a speech. Now, its the day of the event. Where I have to deliver that speech. But I am very much nervous, heart is pounding very loudly. I have no idea what I will do at stage and negative thoughts is striking my mind again and again. Like these people will watch me giving speech, what if they did not listen to me, what if, they don't like it and there were unclear bad thoughts. But Luckily I have learnt meditation from Internet and suddenly it striked my mind, then I applied that logic there and started watching my thoiughts as a third person.. and I started asking questions. Like when thought came," What people will say?" I asked what? 

Thought disappear next thought came,"What if people ignored?" I asked let them, you have control only in giving your best.

and this goes on and on and on. It relaxed my mind, and then I decided I will not think there before speaking and suddenly I became empty minded and after few minutes I delivered speech beautifully and I think everybody liked it. Because they gave me review at the end of the speech. 

So, It's always possible what we think we cann't do, but you should follow these points, or create your own, doesn't matter. If you get little bit demotivated than watch videos of people doing different things, many disabled people are doing which we cann't even imagine and we give a reason for everything instead of appretiating that leads us and our confident downwards. Sorry for the Bad Engllish.