Definitions:
Desire: a strong feeling of wanting to have something or wishing for something to happen.
Lust: a passionate desire for something.
Psalms 37:4
“Delight thyself also in the LORD; and he shall give thee the desires of thine heart.”
In Judges 14:1-4, Samson sees a daughter of the Philistines, and asked his parents to get her for his wife. In verse 4 we see that even though the relationship was not pleasing to his parents, it was the will of God. God needed an occasion to usher in the deliverance of Israel.
Where does desire come from?
According to Psychology Today, “Psychology in general leans towards the former possibility: It’s all been somehow pre-implanted, and only activation is needed.” (Shorter, Ph D, Edward, Where Does Desire Come From?, 7/15/15).
I would expand on this belief…
In a nutshell, man is born with a desire toward God. This desire is cultivated through life experiences. At some point we come into contact with God (by attending church, or a testimony from a believer, by hearing the word preached/taught on internet or radio, by reading an article, etc.). We then have a choice to make, either acceptance or rejection. With acceptance (or activation) should come relationship. With relationship we are to be (or should be) lead by God.
From this point, even our desires should be in line with the will of God.
This is why we must also deal with lust.

The Bible says that we face temptation because of lust. James 1:14, “But every man is tempted, when he is drawn away of his own lust, and enticed.” Notice how the scripture says “his own lust.” This is not something from God. This is your own hang ups that pulls you away from God. This is not something from God or even of God. This lust is all about you.
Even so, God is faithful, because with every temptation he makes a way of escape. This let’s us know that God understands us. He does not approve of or support our sinful desires. However, he does love us enough to provide us a way to escape the sinful desire.
What a great God we serve!
Understanding Desire

Now, when we are in God’s will, even the things we desire should be God given or inspired. This is where that psychology “pre-implanted” thought comes into play. God has a plan for our lives. Everyone has a purpose, a calling, a specialized gift or talent. We are to use these to bring glory to God. So when you have a strong feeling of wanting to have something (desire), that is God inspired as well.
So move forward, understand that your desire is not lust. God has your back, stay in his will. Because you delight your self in God, he will continue to give you the desires of your heart. How? Because Hebrews 4:12 tells us that the word of God is a discerner of the thoughts and intents of the heart. You may know know or even understand everything that is in your heart, but God does. That is why he is able to give us what we need. Because he knows (even before we do) what is in our heart. You may not know why you lean towards certain things or ideas, but God does.
For you, The Ordinary Just Won’t Do

There is a purpose behind you wanting the things you do. Continue to seek God for those things. Take the necessary steps to achieve your goals, giving glory to God along the way.
Understand that,
-There is purpose in your pain.
-There is strength in stretching your faith.
-There is victory in striving for excellence.
-There is nothing wrong with ordinary. But understand that there are times when the ordinary just won’t do.
-Do not settle for ordinary if God is pushing you to greater. Focus on achieving greater.
He knows how to bless us just right!