The test question is:
What you have right after "Siente" is a subordinate clause using "que..." - in which case you need sentir, not sentirse. In a sentence using "Siento + [que...], that whole subordinate clause "que..." is acting as a noun, therefore you're feeling "something" ( = sentir )
I feel something.
Siento que estoy perdida.
I feel something and this something is "that I am lost."
I hope it clarified it.
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Test your Spanish to the CEFR standard