Okay...well, when I was your age, I was no fan of doing homework either...I think very few middle school students are excited about doing homework. The fact that you took the time to register here and post looking for help suggests that you want to succeed, and that's a big part of being motivated.
As far as actually doing your homework, I would suggest setting aside a certain time each day for "homework time." Make sure the environment is good for study, relatively quiet with few distractions.
And if you encounter problems that are confusing, then by all means post here to ask for help. We will be glad to give you guidance in understanding the material better.