Yes... Doesnt everyone!
I think the anticipation or thinking about eating sperm in your mind is far more exciting then actually doing it. As a young guy, I really got turned on about just the thought of tasting my own cum, however I quickly lost desire after an orgasim. Eventually it happened and tasting my own become a routine. It was always great to taste a lil pre-cum during wanking or masturbation, then to lick up the final load. Do not do it so much anymore, However! Its the anticipation or thinking about tasting another mans cum that I find exciting now.
I am the same in some regards. I have tasted more pre cum than actual cum, because I am all revved up whilst wanking. Then like you lost the desire once I had cum. I have only tasted my own seed a couple of times, however have no desire to taste another mans. Mine was enough, now I am done.