It is easy to worry. That is why it is such a popular pastime. Anyone can do it. No special skill is required and the world is full of people who will support you in indulging your anxieties, just as long as you in turn support them with theirs. And, of course, it is surprisingly hard not to worry. That takes special effort and discipline. Even when the art has been learned, it is never fully mastered. Training yourself not to worry about one thing affords no guarantee of immunity to any other cause for concern! Even so, try the difficult option. 
We have all got language. We can all find a way of requesting a cup of coffee or tea. We know how to make ourselves understood - at least in this basic way. But how good are we at communicating deeper, more profound thoughts? When it comes to sharing our thoughts and feelings on strong emotional matters, we tend to hint and allude. It is hard to be so bold and direct. Listen carefully to what someone is really trying to say to you now. Give them the benefit of the doubt. What seems trivial actually conveys great meaning. 
'Right! That's it! From now on there is going to be no more X-Y-Z.' With statements like these, we attempt to assert some sense of control over chaotic factors. Sometimes, we find it easy to adhere to those declarations of intent, sometimes the new regime proves hard to establish and sometimes... Well, sometimes all that we have promised ourselves comes to pass but then we slowly start to see that perhaps we have been a little too hasty. It is not too late for you to back down from a place that you have only recently occupied.
How much do you trust yourself? There can really only be one acceptable answer to a question like that. It needs to be 'a lot'. Or words to that effect. If you can't say that, you need to work on your relationship with yourself. The good news is... that's a fundamentally healthy relationship! Even if it has been damaged, it can be healed. Even if you lack confidence, you can gain it. You can accomplish almost anything, as long as you keep your doubts in perspective and afford yourself the respect you deserve.