There is nothing that you have said which would indicate that there is 'something badly wrong' with you.
It was only until very recently that I began to understand what 'stress' is. To me, stress is the currency in which we use to interact and engage with the external world. Stress is what our world demands of us in exchange for our participation. I like to think that we each have our own stress account (like a bank account), and each time we interact with the world, like driving to work and being cut off by an inconsiderate driver or waiting in line at the grocery store, we spend a little bit of our stress currency.
There will be sometimes though, that the amount of currency that is being demanded of us is greater than the amount of currency that we actually have at that time. That could be due to a significant transaction, such as the loss of a loved one, or it could simply be an aggregation of all the tiny little stressors that we encounter throughout everyday life. Simply put, there is insufficient balance to make good on the world's demands.
The good news is, just like any bank account, it can be replenished. Bank accounts are usually replenished through employment. Stress accounts, well they could be replenished in numerous ways. Some people run, some people read and watch TV. Others go on holidays, or have coffee with friends.
I think the advice that others have given above re: seeking a GP is a good place to start. Talking can be helpful. You might start to uncover the answers to your questions.I should probably take my own advice here really.
I would like to leave you with the thought that there is nothing wrong with you, you simply need to find your path which will allow you to replenish your stress account.
I wish you nothing but the best.