You know those little chats good friends have with you? Well, please take this as one of those, if what follows applies to you.
You attend a talk, a workshop, a reading event. You contact the speaker/writer later, and say how much you enjoyed the talk/reading/workshop. And how much you want to learn about writing. The speaker/writer replies, thanks you for your nice message, and gives you a link or two to places where you can learn interesting stuff about writing.
You write to her again, to say thanks. How interesting. But you also attach some of your work, two full length stories, and say, 'Be honest. Give me some feedback. What do you think of these?'
The word in your ear is Please please don't do this. Entrusting me with your work may be a lovely thing to do, but you don't know me from Adam, or Eve. First of all, you don't know that I will treat your words with respect. You don't know that I won't 'do a Bruton' and use your ideas and plots for myself. Your ideas are precious.
But also, you are making an assumption. You are assuming I have a couple of hours to spare, with nothing else to do to fill them. You are assuming that I do not have my own work to do, my main work - my writing. You are assuming I will do your critiques unpaid, instead of the critiques I might be doing on a paid basis for other writers.
All I am doing is asking you to think...