Those who can't say "NO"
There are people of character, those people you always feel when someone try to use them and they will never let one to use them for their own purposes in case they will get no profit of it. Though, there are those who simply can't see that people use them and so they are used and they do all those things people ask them to do and the have no time for their own life.
There are also those who feel people use them but they just can't say "NO" those people and this is the main reason for why they are not very satisfied with their lives. There is no way for one to be happy about a fact that someone uses him or her for its own purposes. Though, people appear to be too shy to refuse a request and so they do another task, another job they don't have to do.
Though, they always to things people ask them to do and they have no time to do their own job. See, they are people of no character and people of no self respect. Or they are people who are afraid to offend someone. It is a wrong policy and such a policy usually leads nowhere. There is no way for one to call a friend a person who always uses him or her.
Moreover, those people who use one are clear with the fact that they use him and her, so they will never get offended with a refusal. They may be confused with it and they may be surprised with it, though they will never get offended with it. Moreover, they may start respect one for the refusal.