Expectations

Its strange how many people expect too many things from you without realizing that you may not really be up to it.But they do so all the same!For example,my mother thinks that Iam the best (But all mothers are the same,fortunately!).But when close family members,one's spouse or children or friends expect certain things from u and u dont think you can simply do it.Then that's a really frightening and upsetting situation.It does boost ur ego though on the flip side!
Now for example someone who will remain nameless,thinks I can write well, but my imagination is at a nadir and words just do not come to me.What do I do?