A lot of people who mainly answer questions use WorldBuilding.SE to take a break from what they are doing right now
The process of focusing on something else helps in relaxing and getting new insights to what you are really working on if you get stuck. This seems to be especially true for those people that enjoy answering questions. They tend to distract themselves a bit so that they can focus again on their real work after spending some time working on a completely different topic. See for example this answer to Why do YOU hang out on Worldbuilding?.
Many people use the site especially when they have a writers block
This one is especially true for people who are contributing by asking questions. They are working and working and working on their project - but they feel like they don't really can go forward. So they ask for help to get different insight into their problem and a new perspective.
Others tend to do nothing but read what they find interesting
Read this answer to Is a jet dragon possible? and tell me you didn't chuckle. Perfect to relax in my opinion. I love the site for stuff like that.
There is also a chat
I think I recommended the chat to you before on some occasions. If you feel like talking about - well, whatever you want to talk about - that is the place without so many rules. Often there are less people. It's not as active as you might be used to from normal chats, but sometimes we have interesting conversations. The humour of the people there often feels relaxing to me. Even if I only read the transcript or read what the others are discussing because I don't know anything interesting to contribute.
Others are weird...
I like to watch out for people with typos to edit their posts. It's relaxing to improve stuff. Make it better. Closer to being perfect. I like that.
And I keep an eye out for the Sandbox to help people with their drafts. Fixing grammar and wording. Stuff like that.
Why are you telling me this?
If what you are doing right now makes you feel blocked in any way - stop what you are doing. At least for a bit. Find something different. Some people would be stressed out trying to find something they can answer because they can't find anything. Others would be stressed out trying to bring their question into a suitable format because their questions are often "Too opinion-based". Again other people would be stressed out doing nothing but reading, needing the mental activity of doing something. Being in multiple active discussions at the same time in the chat when there are many people online at a given time can be tiring for some people, too. I would be stressed out if I wasn't able to fix typos when I see them. I hate reading wrong stuff when I know what the correct thing is.
What you are experiencing is pretty normal - when you haven't found the right mixture of activities yet.
Stop what is blocking you.
Find what you like and what helps you relax.
And remember: this is probably an iterative process, that will get changed over time and with a lot of doing stuff only occasionally when I feel like it. For example I only answer stuff when I love the question and have a great idea in the first moment. Not when I have to research too much. And that's okay.