[....]
100 dollar is for personal use. I can use it to anything I want. I use father's credit card for my expenses.
How about you use your father's credit card to buy bitcoin instead? hehe.
Do you have some savings set aside? I'm not familiar with the culture there but you probably have a few years left to pursue a degree in college and you are already at the age where you're legal to work. He can decide to cut you off any time now.
My personal take here is to save that $100 and try to earn on your own with some side hustles. Use whatever you receive there to buy BTC.