Although it's often uncomfortable to write too close to one's own fantasies, or deep emotions, or other personal stuff, the end result is generally worth it. Nobody will pick up on the stuff that's absolutely specifically you unless you repeat a specific thing in multiple fics. I was just rereading a group of fics I wrote between 8 and 5 years ago, and I picked up on something from my personal life that snuck into a dozen of them -- and not a single person caught it back then, even my betas. As a rule, people are usually too caught up in their own crap to hyperanalyze anyone else's. (Fictional characters and famous people aside, obviously.)