Could this be an eating disorder or unhealthy relationship with food?

[Justalittlemore]

Hello, I'm posting because I sense there is a problem with my relationship with food and hope someone can confirm or not.
I've been on a weight loss quest for quite some time, I'm also quite depressed, take medication, have been really in quite dark places lately.My weight loss started out just normal,being more careful ect,good quality food.But as time has gone by, I realise I hardly ever eat the same meals as my family because i aim for something less calorific, if no one is around i won't eat all day until evening, but I don't feel any hunger.
I just keep reaching my goal weight but have to lower it because I'm still fat basically.My bmi is 17.3 so i realise i should be content but it's just not enough.

"I'm still fat basically.
My bmi is 17.3"
Only one of those statements can be correct. No one with a BMI of 17 is fat. I think you should seek some professional help about your relationship with food.
Please don't add to your mental burdens by thinking of yourself as fat. Your worth as a person is so much more than the amount you eat, or what you weigh. Try to be kind to yourself, build in something nice every day.

Definitely disordered eating. Do you know how many calories you are eating per day? You are underweight and by carrying on restricting you could be compromising your heart health.
You need to speak to your GP about it. Are you already under a mental health team?

Please, please seek medical advice; to be concerned that you are fat with a BMI that low is really not a good sign. It's not good for your mental health and carries all sorts of physical health risks.

I know someone's worth isn't related to how thin or fat they are, I just can't seem to think differently about myself.I have extremely low self esteem possibly due to childhood trauma.
I try to aim for a minimum of 800 but some days its more like 500 or 600 hundred.I always use to have a few days were I kind of binged during pms but that didn't happen this month, i ate probably a 1000 for a couple of days but that's it.My gp sort of knows I have issues but not how much i suppose , i think she's been more concerned with my suicidal thougts.