My life got a lot better when I stopped believing anything and just decided that there are maybe one or two things I'm fairly confident are true. As in, I'm pretty confident that I exist, and fairly confident that you do. But I couldn't prove either of those, and everything else is basically up for grabs.
That's a big tragedy in our society, that you're expected to have a definite opinion on everything. Myself, I have very few strong opinions, and those that I have I hold loosely. When someone asks, I usually try to sketch the space within which I believe the answer lies (e.g. "I suspect X, but then there's Y and Z, and also V I'm not sure what to do with"). This has a nice side effect of making strongly-opinionated regulars suddenly unsure about their own opinions.
I am also this way by nature but it drives a lot of people nuts so I’ve learned to temper it for the particular audience, expressing confidence appropriate to the context of our shared assumptions.
I don't think the OP said that they have no opinion. Beliefs are a conviction based on cultural or personal faith, morality, or values. Opinions are viewpoints, we all have them, but it's good to be aware that they're not based on facts.
