I think I'm prejudiced

Maybe I'm being too hard on myself but I don't think so.  I like all my students but there are some that I just have a hard time caring if they do well.  They always show up late if they show up at all.  They always expect me to stop what I'm doing with the whole class and help them catch up with what we are doing.  They do the barest minimum and never seem to read any of the instructions.  So whenever they ask for help I am very hesitant to go to them.  I am trying very hard to get over it and I help them no matter what but there is still that feeling like you should know better.