When you are aware of what you CAN have, reflect on the fact if it's actually what you truly WANT.
We are capable of getting what we want in life. We just need to put in the effort towards achieving it. Yet, when you do get it, sometimes it ends up being not what we truly wanted. The desire of wanting it so bad ends up fading away.
Don't be hard on yourself. Next time when you have a desire to want something so bad, take some time to reflect on the pros and cons of having it in your life. Be true to yourself on why is it you desire having it so much. You may realize it may be something you actually don't want. Rather it may be something you desire just to fill a void.