First symptoms

Most people just can't see that they are people of no character indeed. First of all, to deal with some problem it is important to recognize this problem at first. It is important to realize that you are the one of I-can't-say-"NO" kind. After you will realize it there will be something you can do in order to get rid of the habit never say "NO" to people.
So, now we will try to realize whether you are the one of this kind. In case you feel that you do too much for people it is possible that you are the one who is used by other people. In case people always come to you for help it is also a symptom that you are used. There are a lot of people in the world, so why they come to you?
Think over, do you have enough of time to do the entire job you have to do? You don't? In this case think over, may be things you do for other people take too much of your time and you have no time to do your own job. In case it is so, than you are the one who can't say "NO" to people. It is high time for you to realize that you have a problem and you have to deal with it.
And one more thing, identify the one who always asks for your help and ask him or her to help you. In case this person will say you "NO" than things are clear – this person is a one who uses you. Be smart and say him or her "NO", don't be afraid of hurting a person.