What a beautiful thing to do! If only people in our society were as kind and generous as you.
You've done 10 to 15 today and that's a great achievement. Well done! It's okay to take a step back, breathe and calm yourself. You will not get into trouble for this. It's more likely people will feel more touched than upset. If you can manage it, you can do another 10 tomorrow and another 10 the day after.
I once lived in a student hostel where I was asked to help with handing out welcome gifts (a lunchbox) to other students in their rooms. I think there were about a 100 or so. I was terrified at the thought of having to potentially come face to face with the other students, worrying that they may be unhappy that I was disturbing their privacy. So I left the gift outside their doors with a note and ran off. Turns out I didn't have to worry at all, because I later saw students using those lunchboxes. That made me so happy.
You're a beautiful soul, Yelah90. I'm proud of you for starting on this. Now take some time off and take care of yourself, because this lovely action doesn't need you to suffer :)