Why do I feel tired and find it hard to do my everyday tasks?

Hello doctor,

I had trouble in school and had a hard time concentrating on what the teacher was teaching. I used to forget what she said and did not know how to do the lesson. Today it is hard for me to talk to someone because I forget what I wanted to say or what they are saying to me. I have had a hard time finishing what I started, and sometimes I have difficulty starting something. I am so tired all the time, I feel very slow, and it is hard to do my everyday tasks. I have so many goals and ambitions, but I have all these obstacles that I am trying to overcome. I feel like I will never be the type of person who succeeds in life and their goals. I would not be a better mother for my kids because this has affected my parenting. I have very little energy to play or interact with them. I need help figuring out why I am like this and what I can do to fix it.