I can't do it! I can't live with hunger

There's a few things I can see where you might be getting more calories than you intend. The salad dressing/added oils, for example. I'm guessing that in part the unweighed dinner is in the way.

How are you doing on 'macros'? Are you getting enough protein? It seems to me like you have a lot of whole grains and fruits but not much protein.

My personal experience is that my body doesn't seem to register 'full' by counting carbs or sugars. But it's very effective at feeling full when I eat fats. Maybe your body has the same quirk.

I am older, fatter, and less mobile than you due to orthopedic injuries that limit my ability to exercise, but have a similar calorie target because of my high starting weight; I've returned to mfp this week after a long absence, and my target is 1750 cals. I'm not having difficulty meeting that target and not feeling hungry, and I think it may be because I have skewed my macros to allow fats and reduce carbs, without going to the formal extremes of a 'low carb' diet.

Here's the framework a typical day for me; since you don't eat mammals you might substitute lox for the bacon.

breakfast--
2 large eggs (140cal)
2 trader joes apple-smoked uncured bacon (248 cals) (substitute same-calories of lox to avoid eating mammals?)
green tea (0 calories)
fresh fruit--50 to 100 cals depending on type and weight
(~490 cals)

lunch--
10 oz homemade miso soup--(you could substitute another soup here eg trader joe's ancient grains)
Hikari - Organic Dashi Miso (Bonito and Kelp Stock), 1 tbsp (33 cals)
water to dissolve miso (0 cals)
100g tofu (70 cal) (it is worth finding an Asian market that sells local-made tofu, if available)
3 g dried wakame seaweed (1 cal)
1 green onion, chopped (2 cal)
10g fresh shiitake mushroom (4 cal)
fresh fruit--50 to 100 cals
(~210 cals)

dinner--
mahi mahi filet (frozen from costco, ~180g) (140 cals) (you could use a different protein here)
trader joe's mango ginger chutney, 2 tbs (50 cals) (small amount of whatever enhances your protein)
microwaved veggies (~100-150 cals)
fresh fruit 50-100 cals
(~490)

snacks--1750-490-490-210 = 560 calories "discretional" to use for snacks or add to the basic skeleton of my meals. I tend to drink a cup of warm whole milk at bedtime, so thats 150 cals, leaving 410 calories discretional for all other meals, condiments and snacks. You could, for example, have a (45g when measured dry) portion of rice at dinner (about 170 cals), though this would bump up your carbs. You could also add a selected type and quantity of dressing to your vegetables, and/or choose a higher calorie lunch (btw I think your tuna lunch would work).

I didn't list the macros here but depending on the discretional choices this comes out about 10% high on sugars, 10-20% high on fats, 20%-30% low on carb targets, and between 20-24 on fiber.

You could try my typical day (modified to be no-mammals) for a day and see if this low-carb 'high' fat approach works to keep you full but on-target. The big difference from what you are doing is that the above diet has a low grain content. For my metabolism, grains are too many calories for any benefit they give; if I need to up my fiber I reach for beans (more protein less carb).

PS: I have read but not personally tested that for some people yogurt can cause them to have a plateau and not lose weight. You'd have to experiment to find out if that applies to you or not. For me, if I want yogurt I eat yogurt and if it causes a temporary plateau I don't worry about it.

Your meals don’t have a lot of food. Except the 85g of oatmeal. 70g of chicken is a really small amount. A pita with 1 oz cheese or a can of tuna wouldn’t work for me. Both together would be closer (but maybe not). And there’s not a whole lot of protein happening overall.

I would be ravenous eating what you’re eating. But I’m also satisfied with volume and fiber. Others find protein/fats/etc to be more satiating.

Experiment with other foods. Try things out. I don’t typically eat much in the way of breads/cereals because they have more calories than I’m willing to spend on something that doesn’t fill me up.

Also consider swapping so your larger meals are at the end of the day (unless you’re hungry early too). That might help some.

Basically- try different foods, try different combinations of foods, try different timings of foods.

I eat about 1600 a day on average and run 5 days a week (and lift too). I don’t do hungry.

And do weigh everything. Calories count the same at all times of day. Which is great because then it doesn’t matter when you eat-but it makes all those dinners with all those oils and things count just as much as the oatmeal and the pita.