On mobile, sorry!

I starting doing a lax 16:8 2 weeks ago, and only started counting my calories 5 days ago. I am a 5'9, 165 pound female, and this week my daily average calorie intake was 900.

I swim every weekday for about 25 minutes, and walk to my college classes, which equals about 5000-6000 steps per day.

I typically eat a protein bar in the morning with some coffee, swim during lunch, and eat an early dinner around 4pm.

I am concerned about my low intake, however I feel full after every meal, despite the small portions. Is this something I need to address, or is a low calorie intake normal for IF?

Edit: It is worth noting I am a vegetarian, who does not currently take supplements.