First thing first I thank to you all for sharing your opinions with me. If I don't lose the base money then yes I can surely handle the loan's interest. But if I lose like %20-30 then bell of chaos is likely to start ringing.
In that case, there's no point in gambling - because what you want to do can't be called anything else. If you already want to invest in BTC, study the DCA method, or simply invest only as much money as you can afford in the sense that it cannot affect your life. Forget about banks and loans, that's a recipe for a very likely disaster.