Afraid I'm Not Eating Enough

I'm barely 5'0 and MFP has given me a goal of 1200 calories a day (which will apparently yield 0.8lb loss per week as anything higher requires dipping under the healthy amount. My issue is that I was easily eating over 1200 calories a day before and not choosing the healthy options. However, I wasn't eating all that frequently. In changing to lower calorie options, I'm finding myself full at around 1000-1300 calories. On days when I go for long walks or hike, MFP wants me to eat another 200-400 calories. I usually note this around 6PM after I've eaten dinner and eating more feels really forced and makes me uncomfortable.

I'm worried that I'm not eating enough but my body doesn't want to eat as often or as much in one sitting. I haven't started feeling tired or lethargic yet and I used to net about the same when I wrestled in high school at around 51kg without feeling poorly.

I'm 21, 5'0, female, and currently at ~133lbs. I sit on my *kitten* most of the day and have a fitbit that's motivating me to walk more.

1) How worried should I be that I'm only able to net 1100 most days?
2) Are there any particular kinds of foods that are less filling but good nutritionally to make up the difference?

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