You need to desire with extreme passion what you want in life. No half hearted 'Perhaps I will' type approaches here. You MUST emote your goals with power. If this idea seems daunting, then remember how you can use the skills you are currently using to make yourself feel daunted, to feel enveloped in uncompromising desire.
If you do not believe the above, then you can be confident that you can use the skills you use to disbelieve, to believe absolutely that you will attain whatever you desire.