Posting dilemmas

Often, when I read the posts of others, I feel for them, and want to respond something helpful & supportive. But then I start to worry, what If it is unhelpful? What if I write the wrong thing and make things worse for them? And why do I want to be helpful anyway? To make myself feel good? So is it even about the other person?
I've only been on this site for a couple of weeks and it's been so good for me. I've realised so many things about myself, through the posts of others. And the opportunity to share those revelations is so great. I want to give something back.
And then there is the dilemma of time - posting takes time. Time I could be spending in the real world. I want to spend less time on electronic devices/online, not more. But I need to spend some time on me. And this seems to be helpful. How to find the balance?
I do have a lot of dilemmas. Thanks for listening. My dilemma outlet.