I have chronic insomnia. It is not the end of the world. Take a deep breath. The things that help only do so when kept up in routine. Meaning you have to do them. Now for me, I made a nighttime routine. Brushing teeth, brushing my hair, changing the filter on my tablet and phone using an app called Twilight made it so that my eyes aren't strained. Also not reading or eating in bed. Truthfully, your body might simply might not need the rest. To reboot your sleep cycle. Do it when you don't have something to do for the next two days or so. Stay awake. Go to sleep the next night. I do this reboot twice a year. You don't need to tell your parents, but you can if you don't want them to worry. You could even make a sort of game out of it, doing something that would get you tired, like having a family outing.
I find what helps me most is getting rid of excess energy. I sometimes just go walking or just sitting in the park, being out of my room. Give it a shot.
I do think that it is worth letting your parents know what is going on. However, there are several things that you would definitely want to try before using any meds. The link I am giving below is for people with ADHD who typically have a very difficult time going to sleep. If these techniques will work for them - they should also work for somebody who does not have ADHD.
The link is - http://www.additudemag.com/slideshow/22/slide-1.html
I say you should tell your mom and maybe try some sleeping pills such as melatonin, etc. If the sleeping pills don't work then you could have a word with your doctor for prescribed sleeping medicine. I have had insomnia for years and trust me, you should tell someone about this because if not, you could end up exhausted every day.