Finally tried taking it and was a litle mixed on wether I liked it. It was painful then pleasurable then ? What do you do to get the max enjoyment? I think I did something wrong.
Did you enema beforehand? Often choice of lubrication makes or breaks pleasure during anal. The thicker, more viscous lubricants work best for anal as they tend to reduce friction to a greater degree than the less viscous. The skill of your top also comes into factor. Did the top slowly relax you into the fucking or did the top just ram it in? Slower is usually better to initiate. The problem could lie in a lack of flexibility in your sphincter muscle. Like any muscle the sphincter can be trained to become more flexible by progressively increasing the range of stretching over time in minute increments. Lastly the particulars of your physiology may not make fucking pleasurable to you. You may not have the specific nervous design that allows for erotic sensation in your ass, though I suspect this not the case as you claim at some point it felt pleasurable.
The OP might want to also try a good strap-on domina. I used to frequent one that knew how to hit me just right and get the prostate charged up. Sometimes it was like having a five minute orgasm. She was a real pro, though. Hard to find one tat really know how to weild a strap-on properly.
A skilled top certainly helps. Many men due to certain deviations in their anal biology cannot find pleasure bottoming. From experience I am one. A dick up my ass makes me feel like I need to pee and that is only after an initial burning pain subsides.
I guess I'm pretty lucky on that front. My last session was with *two* dominas who pretty much used me in every position for nearly an hour. I wore both of them out. 
My early sessions flet as you describe it, though. You might just get used to it like I eventually did.
you must learn to relax and make sure to give yoursef a good enima first.
Take it like a man... Prison shower scene style! Perhaps his complaint is with the pleasure not the pain.
Thank you, it seem I did everything right, I guess I need more experience and a litle more lube. What is the best position?
It really depends upon your biological anal architecture. Experiment.