forgeting to eat?

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I'v recently gone to the doctor and found out my BMI is too low. (6ft, 130lbs) Upon hearing this I realized how out of wack my eating habits have gotten. I literary forget to eat. As summer has little structure I wake up, have a late breakfast of orange juice and a breakfast bar. As the day goes on I'll get hungry, be too lazy to make my own food and then I'll forget that I'm hungry and it goes away. Eventually Ill have a late dinner/ lunch and sometimes I have a small snack late at night. After weeks of this my appetite has shrunk and I no longer am able to eat whole items I use to still be hungry after eating. Any advice on how I go about re gaining weight and remembering to eat/ meals that I can have with little effort?

In addition I also have depression (un-medicated) and I feel that this is somewhat related to my forgetting to eat.

Thanks

also im a 17 y/o male. if this helps at all