Fear

Deep down there is a good fear, related to respect. Fear of fire for example and knowing to not just stick your hand in it is fine. As we move up in stakes we can find our mind focusing on the wrong things. That 5x BB $1.25 raise on a 25 cent table is not any different then a $2.50 raise on the next table up or a $5 raise on a $1 table.

If you can not afford to lose your buy-in, for example when calling an all-in pre-flop bet while holding pocket Aces, then you should not be playing those stakes. You will eventually find yourself under attack when your opponents smell your fear. You will not protect your hands properly and also start second guessing your play. Do not allow the stakes to affect your game.

By the way, lack of fear is also not a great thing. Calling someone's big bet just because they have a small stack can cost more over the long run than is obvious at the time. You still need quality hands in these situations. When someone shoves their $5 on a 25 cent BB table, consider would you make the same call if the player had another $20 to continue with? I know the betting is capped with the short stack, some hands make sense to call here, stick to those hands based on your knowledge of the player.

Same thing goes for moving down in stakes. It can help you work on being more agressive, as long as you play with respect. Showing no fear will lead to a break down of discipline.

Find a comfort zone where you are playing winning poker and have goals to work towards.