@turkay1-- I didn't know that chapatis are such a good option for diabetics. Thanks for that information. My aunt is a diabetic and she loves raised bread. I have to convince her to switch to chapatis as soon as possible.
Don't worry about not getting the perfect circle shape. In some parts of India, chapatis are made in the shape of a triangle. If that's easier for you, you can do it that way. I remember when I started making them, mine were kind of oval too. The flavor is the most important, the shape will become perfect with time.
I think the secret to making soft chapatis is to first mix flour and vegetable oil together and then slowly add lukewarm water to make the dough. Add some water, and mix, add some more and mix again until it is the right consistency. This should make nice and soft chapatis.
Something I also do while cooking chapatis is to take a towel and apply some light pressure with it on the chapati while it is cooking. This causes small bubbles to form on the bread and for air to circulate on the inside. It makes the bread softer and more delicious.