Jewish things

When people ask me why I became frum, I can never give a satisfactory answer. If I say its because of all the seforim I read that "convinced me" or "showed me the truth" of Torah, people assume that I'm not realistic or can't make my own decisions, that I'm basing my life on how someone else is telling me to act in order to be a "good person" or live a meaningful life. If I say its because I found value in the lifestyle, I'm an escapist, turning to an antiquated and isolating way of life to avoid the difficulties of the contemporary world. And if I say its because of G-d, they dismiss me as someone who has heart and good intentions but who lives in a fairy tale. G-d Himself would never require a lifestyle like the one I've chosen; and bible critics have proved that He did not give the Torah. My awareness of His existence is commendable but not linked to any practice other than prayer. I'm frum because someone ("the rabbis," "cult-leaders," etc.) tell me to.
I've always lamented the fact that I cannot answer the question of why I'm frum in a way that people will hear or understand. I want to say something inspiring so that they might also see the value in being observant, but so much of the time I am overcome by feelings of being judged. And the truth is, I've judged and questioned myself so many times that I once I was able to get past most of my doubts and be truly comfortable with where I am, I don't want to owe anyone else an explanation. When I go out for coffee with friends, I'm not expecting one of them to launch me into a fierce debate in which I have to defend the authenticity of Torah against a bunch of atheists. And when I was in their position, there was nothing anyone could have said to me that I wouldn't have scoffed at. It took years of learning and backtracking, re-examining and careful consideration for me to be in the place I am today; I have a hard time imagining that there is anything I could say that would reach them.
These are not excuses, I know. When I talk about Torah and my voice lacks confidence, I'm giving people the impression that I am not sure of what I believe. I know I need to try harder to answer others' questions in the best way possible, I'm just still not sure of what that is.