Need to stay focused on "MY" goals and stop helping others!

I hate to be mean to others but I think it's time!!! I've noticed that everytime I take a step forward.....someone pulls me back 2 steps!!! I use to give an exercise class at church to help out not only my sister but some others in the church as well. Well that didn't work out because everyone was lazy and didn't want to workout! Now that I have myself focused and in the gym more....I have a neighbor that wants me to walk with her "2" days out the week. So I change my classes around at the gym just to walk and where is she???? I shouldn't have to call her on these days to ask,"are we walking today"?? I feel she should call me...plus if its something you want to do, you will see to it that it gets done!!! I've made up my mind that I'm not calling her and I'm changing things/my classes back and I'm going to focus on me once again. I need to stop letting people get in the middle of what I'm doing for myself...I don't know why I keep doing that!!!