Psalm 37:4.

Delight yourself in the Lord, and he will give you the desires of your heart.
[Psalm 37:4]

From the ESV Study Bible:
Ps 37:4 - the desires of your heart. Some take “the desires” as referring to the feeling of desire, i.e., “God will shape your heart so that it desires the right things”; but the sense is rather, “he will give you what your heart desires.” It is safe to say this to those who embrace the advice of this psalm, because as they delight themselves in the Lord, their hearts will desire the right things.

The Lord will give you what your heart desires, but He will also shape your heart to desire the right things. You must first seek the kingdom of God, and all these will be given to you as well [Matthew 6:33].

But you also have to keep in mind...

When you ask, you do not receive, because you ask with wrong motives, that you may spend what you get on your pleasures.
[James 4:3]

God doesn't give you certain things because you're asking for all of the wrong reasons. Like I said before, as you seek Him, He will change your heart according to what He wants for you even when it's different from what you want for yourself. God is our loving Father. He wants what is best for us.

Just take a couple of minutes and examine the things you ask of God and why it is that you want them.

Ant