Many people develop an inferiority complex due to a lack of self-confidence. Once you eliminate that inferiority complex, you will find yourself able to achieve a higher level of success than you ever thought possible.
Picture yourself succeeding.
No matter how badly things are going, picture yourself succeeding in the future. Hold on to that mental image, do not let it fade.
Cancel your negative thoughts out with positive ones.
Whenever you have a negative thought about yourself and/or your capabilities, come up with a positive one to cancel it out.
View your obstacles for what they are.
Do not allow your fear to turn a small obstacle into a big one. Focus on the actual problem at hand and figure out a way to deal with it.
Do not compare yourself to others.
Nobody can be you as efficiently as you can.
Estimate your skills/abilities, then raise it by 10%.
Do not become egotistical, instead, develop a wholesome sense of self-respect for yourself and your abilities.