You're right. It is always good to risk your own money than borrowed money. I experienced personally in my life. I had little amount of bitcoin in my wallet, but I took loan to fulfill some home needs considering there'll be growth with bitcoin. My prediction went wrong and now I'm in debt paying interest. If I've sold at the right time I could've avoided debt.
I have a same experience like you. I took money from my close friend to buy bitcoin with 20% interest. But after 1month my btc was down and I had to pay him the money from my own pocket and also the interest. A bad experience. -_-
That is the reason why it is better to earn bitcoin than taking the risk to invest in bitcoin. Price is unpredictable. Invest from your own pocket which you can afford to lose. Loaning is not a good idea but a headache, if you can earn it, work for it.