I’m the same way. I’m not smart. I wish I was. It’s good to be honest with yourself. If you’re stupid, and can admit it, that’s healthy, in my opinion.
Now, you just have to decide what you’re gonna do about it.
People have given you lots of suggestions and videos, in this thread.
Now, you just gotta go step by step, and try to learn. If you don’t understand something, ask.
There are so many people here who are happy and willing to help.
Also, check out the free lessons here.
Your question is a little bit confusional? Which broker’s demo account are you using? Are you indicating to your incapacity to buying and selling currencies or understanding all about trading?
It’s completely normal to feel overwhelmed as a beginner. Don’t be hard on yourself; trading takes practice. Start by focusing on a few assets and developing a simple strategy. Use your demo account to practice placing trades based on market analysis. Take your time, and remember that everyone starts somewhere!
Oh, no need to feel ashamed! It’s totally normal to feel confused. Start small, focus on one trade at a time, and practice with your demo. The more you do, the clearer it will become. We’ve all been there before
Hey, don’t feel stupid! It’s normal to be confused when starting out. Just pick one currency pair you like, practice in your demo account, and set a simple plan like buying at support or selling at resistance. It’ll get easier as you keep going!
thank you Jamie 
The best part about demo, even if you’re wrong, it doesn’t take your money away.
Before trying to figure out a system, get familiar with your trading platform. Entering a trade, existing a trade, adding a “stop loss”, adding a “take profit”.
Figure out how to switch between currencies. Change time frames. I think that’s probably the absolutely basics you need to know.
Then move on top position size, lots, micro lots, mini lots, units, and then sizing a stop loss.
Go from there!
Nice explanation. I will follow your tip and try it in the real world 