One thing I do when I am afraid to tell is tell the story to myself, "both" sides. If I can explain it to me and listen to it and comment on it and get over some of the fear of what I/others will think of it then it helps me and I can better decide if I do need/want to tell T or not. Sometimes the fear gets in the way of the story/problem. The feeling about the problem is not the problem itself and to address the problem I think one has to be willing to face it straight on, first.

I had a sexual problem that was upsetting me badly but which was too intense/scary to tell my T so I had to think it through myself and did and it changed my life, made me proud of myself. We aren't actually weird or different and sexual is just an extension of physical and mental? Fantasies are okay, whether they are about sex or murder or things we are horrified to find ourselves thinking. They are just thoughts and can help us better understand ourselves! We are not acting on them (and even if we are on some, that too can help us understand ourselves). But separating my fears from my physical self, I learned my physical self was/is just fine the way it is and my fears were mostly just an educational problem. Worrying about the future (what fear is) is often, for me, a case of not having much information/experience. I can get that and I can learn (how to love another, how to express myself to another I love so they can better understand me, etc.) but it takes time and practice, like anything else. We're not born knowing how to relate sexually any more than we are born knowing how to communicate and converse with others (why I was in therapy pretty much :-)