ok, I dont understand. for using bitcoin, I either need to mine or to buy. now lets say I choose to buy, here comes the problem. Over the last 36 months , the

ok, I dont understand. for using bitcoin, I either need to mine or to buy. now lets say I choose to buy, here comes the problem. Over the last 36 months , the lowest value of a bitcoin is $3k and highest $57k. If i had bought 1 bitcon at 57k i would have lost 7k by today, again, to buy bitcoin you need to use existing currency. Not everyone can mine and this is my first problem. Next, how do I use this to buy anything? a $100 bill is worth $100 regardless of what, doesn't matter what I buy or where I keep or when I use, it will still be $100, can you say same about bitcoin? this is all speculative and the exponential factor is scaring me out of bitcoin.