Friend question...sort of?

Well...I'm having a problem with friends (more like contacts here) but they seem to be taking advantage of me,they forced me to play fantasy baseball (which they knew I hated it) I told them several times,how much I hated it.but one guy kept bothering me about it ,it happend on chatzy.(not that I expect anyone to care about that part). could their reason to force me to play was because they thought it would be an easy week for them? because I only choose players from my teams,and they knew that. and before they started bothering me I told them I had other things to worry about at the time (like school,and a girl I liked) and they kept bothering me even after I told them that,another thing is that they,asked another contact of theirs and she said she had other things to worry about (which was the same thing I said) and they didn't bother her. and that made me feel sure that they thought they wanted to get an easy week by making me join, and they sort of made fun of me when I traded good players for players on their team that weren't as good. and I want to know what the best thing to do is. yeah I know long and some parts may not make sense,but please try and say something helpful,this has really been bothering me since the day they made me join..