I sympathize with your situation. However, I would be hard pressed to find any of the great ascetics and monks who would regard prayer as "conversation" with God. I could be wrong though and I will invite correction. Your situation does seem to dictate that there is an emptiness when you pray, a sense of a void.
This could be because you are young in your prayer/spiritual life and that is nothing to be embarassed about or ashamed of as we are all there at one time or another and, for me, a lot of times.
My advice: Keep things simple. The prayers of the Church are priceless treasures. I so wrapped myself in them because the words of these prayers expressed what I had so long wish to express with my own heart but didn't have the ability to do so. ANd it was only by constant immersion and adopting a consistent rule of prayer that I was able to come out of the dark. But, I didn't just start using all of them--I worked into them. I 'd recommend you do the same. Keep the same hours of prayer, as you rise and as you are about to go to bed. Then add more prayers and see what happens there. Many others have icons in their prayer corners, some incense, candles burner, some may even play Orthodox chants in the background (that's a little much for me). The point is you want to make sure that your prayer is totally undistracted which is really tough to do. Just I advise my students to have a special place for them to study so you should also have a special place for you to pray.
You say your Catholic priest was not able to help you. Have you considered asking an Orthodox priest for his advice. I don't know if you are interested in converting. But you may wish to seek out an Orthodox priest and see what he thinks. If you are interested in some resources on prayer, I would recommend The ARt of Prayer: An Orthodox Anthology which has a lot of gems from mainly Russian saints and ascetics like St. Theophan the Recluse, St. Dimitri of Rostov, etc. But I would only undertake this work under the guidance of a father confessor.
One more thing--give yourself a break. It is impossible for one to ascend the Cross on Golgotha and not fall, but that is why it is all the more important for you to pick yourself up and try again. In the spritual life and warfare, it is way to easy to get frustrated and, as a result, try to make up for it as if we are appeasing some wrathful God. It's easy to fall into that trap. But don't let yourself especially as our God is merciful and compassionate who has mercy on sinners.
Good luck with your endeavours.