IMO - The mind is very powerful. If you "tell" it something, then in many cases it will try to "do" what it has been told.

"Just looks like I'm not "strong" enough." This is a bad thing to tell your self, because it can lead to doubt and a lack of trust in one's self.

Tell yourself that you are great and improving in everything that you do and you will find that this will occur.

Note that you do not have to tell everyone that you are great, because that could seem arrogant.

I noticed that you used the negative form of a lot of sentences. Get the "nots" out of your vocabulary (and life), and tell yourself who you are. It is very difficult for your mind to determine who you are if you are only telling it what you are not ... I am not 3 feet tall ... this is ambiguous because it leaves and infinite number of possibilities. In a lot of cases, because it is so ambiguous the mind begins to focus only on what you are not.

Put into a golf context: If you are about to tee off and you are only thinking "don't put it out of bounds". There are zillions of other places to put the ball but the mind cannot determine which one is the correct one because it has not been told, so it focuses on the one place where you have told it not to go. What usually happens?
Great golf course designers know that this happens and sets up the course accordingly ... island greens ... tee shot over 100yds of water ... water or bunkers down the right side of the landing area.
Once you pick your target there is nothing between or around where you are now and that target, because it does not matter and the ball will fly there. 100yds of water is irrelevent when you have a 200+yd drive. Island greens don't matter because you know how far you are going to hit the ball (make sure that you remind yourself of this - "I hit my 8 iron XXyds").

Charles