Saying No

So people tell me all the time that I am just like my mom, well I don't always think I am but in alot of ways I actually am. we both have this habit of not being able to tell people no when they ask things of us. So mom keeps telling me that I need to learn to say no. But you see me biggest problem is that I hate to make people mad at me or just mad in general. So all of my life I have just let people walk all over me. But its so hard to tell people no, because I always want to help people and I enjoy spending my time and money on other people more than I do on myself. Mom says its my servants heart. But sometimes I do need to just say no. I am constantly learning that everyday. So keep me and my mom in your prayers as we learn this very difficult thing.