If you are in grades K-8 you might want to check out www.learntobe.org
Just a simple search of "free online tutor" or "online math tutor" through google will give you lots of great websites and lots of not-so-great websites, but you can always check reviews.
If you want to try to understand it for yourself one more time, check out www.coolmath.com
They have lots of math walkthroughs and games throughout the website.
You can also get answres to specific questions through sites like Dr. Math (just search up Dr. Math on google to find it) or www.math.com
If you want to consider a tutor that is not online, check your school. There are other good math students who may be willing to tutor you (usually not for free), and at my school students can recieve free tutoring from teachers and qualified parents when they are falling behind (or if you just ask). Many teachers are also available after school and if they don't specifically say so, don't feel ashamed to ask them.
I wish you the best, though math is my favorite subject, it will get really hard even if you don't understand just one thing and then your class continues on.