I checked in more luggage for my flight than I will end up bringing. Is this a problem?

I'm 16 and tomorrow I'm flying for the first time. As I'm going for a longer period of time when I was reserving my ticket (through WizzAir) I checked in extra luggage with the already provided free one - basically I checked in 1 extra cabin luggage + a small bag. However, it turned out that I will be bringing less than that after all. Will this be a problem at the airport check in? Should I let them know I'm not bringing any luggage on the cabin?

What could've happened to the Malaysia Airlines Flight 370?

I came across some YouTube videos on this case from 2014 and it is still a confusing mystery to me. How can a flight with over 200 passengers just go missing off the radar? It's very chilling to think of what those passengers could have experienced. What are your theories on this case?