Feeling overwhelmed is something a lot of people experience. They can be healthy, have a physical condition, young, older, male or female. Everyone can feel overwhelmed at some point.
It can sometimes feel like your thoughts are bouncing around your mind and you find it hard to concentrate on anything. Your concentration might be affected by this and you might even find it hard to complete tasks you usually find quite easily.
Being a young person can mean you already have a full plate.
Your education, friendships/social circles, family life and growing into a young adult can often feel like more than enough to deal with and this alone can create a feeling of being overwhelmed. Living life with half a working heart and understanding what that means on top of everything else can add more worry. This feeling is completely understandable, you are not the only person feeling this way.