Diet and exercise?

365 days ago to this day I was 280 pounds, I’m now around 166, I didn’t go about my diet the best way, and didn’t eat enough, I got down to 148 pounds (I’m 6 foot) I've been lifting and eating more now, up to 166, do I still look like I need to eat a lot more? My brothers friends told me I should see a doctor and ask if I have a thyroid issue because of how skinny I am, I know I’m not large but I thought I was doing okay, I’m wondering if I’m just delusional and actually am too skinny and I just can’t see it, I eat roughly 3000 calories a day and lift 5 days a week for an hour. Forgot to ad the majority (95%) of what I eat is not junk.
Diet and exercise?
Diet and exercise?
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