There are some people who have trouble believing in things they cannot see and sadly you cannot be taught to believe in something as it is a personal view. Based on my understanding magick is focused around learning to manipulate the energies in and around you to gain a specific outcome when it comes to casting spells so focusing on the basics may help you find belief in the ability to manipulate these energies especially if you come to sense them.
Hopefully this will help. If I linked the correct link! Its a definition of magick I found rather informative and enlightening.
To me, believing stems from the desire to believe. Also, taking no small amount of faith! While I cannot make you believe, and I doubt its even possible to truly force ones views on another. You also happen to find yourself on a forum surrounded by those that believe, remain open minded and patient, take everything in with a grain of salt, but remain open minded. With some effort, perseverance, and desire you will in time find the answers you seek!
I hope this helped, if you have any questions feel free to ask. Good luck in your studies.