Suffering with eating

Hi everyone. I have always been a person who does not eat a lot , but lately I eat like half a meal per day . It's not that I don't want but u can't when I start to eat I quickly get full (It's not usual for me) like I eat around 5 bite and I stop . My parents are trying to help me and they even noticed the fatigue and weight loss that I have

It there anyone like me or had the same experience?pls help me how can I eat better