yes/no/i consider.
theres only three options and "being obligated" is not one of them. why are you making decisions based on feeling the obligation, when there isn't even any?
why commit and say yes, when you're not even certain you will be doing it? why say you are scared to promise? a promise should be made only if its on something that you are going to embark on. if not, its not considered a promise.
disappointment is not even a word strong enough to describe what i am feeling.