It's very typical questions.
What do you thinks about your country's currency. How they actually work? Isn't it just a paper then why we value them most? It's not a beautiful things to keep for us. In physical asset like gold its has value cause Gold has a limited supply. Then why do we prefer a fiat currency which we can just print anytime. Actually money which is printed its not decreasing every year it's increasing.

Here's I'm comming a more details , I don't know If i can explain it or not I will try my best.

In past time peoples was trade their gold for any work cause gold has a actual value.  It's not so called available . But isn't it so heavy or somethin that u can't move or carry easily. So people's make bank system that if we stored our Gold in a safe place the bank will give us a permit of some paper or u can say a check that I've this amount of  wealth . By that permit I can now trade anything from anyone. That permit also have approved by government.

So what we do here ? We do believe that your permit has a value why ? Cause bank secured that.

After a while this type of trade got vanised. Government said that there should be a currencey which have a value and by this we can buy or sell anything. Then why do we prefer such a paper thing ? Cause our government says so and we believe it. If just look in past which pen was 0.50$ it is now 5$ then why this price goes up? Cause government every day printing new money and our old one get value less. And we do belive that it has a value but in actual primw it has no value just a piece of paper. Then what makes it valuable our believes makes it valuable. If every one in the world just decline to accept this paper currency system it will also be a trash.

Same works in Digital currency or crypto currency when BTC started its journey its has very low price. It was value less cause no one wants to throw their money in trash. But when starting some people actually noticing it and accepting this one people attracting more people. Publics were watching it as a some that values it. Althoug btc has a limited volume like gold it's price are just increasing like Gold.

At last If there's in world some people exist who belive in bitcoin or this type of alternative coins it has a value

Investing on BTC its all your personal . If you don't wanna eat rice ball can I put it in your mouth by force? 😃 Just kidding. I hope you get my point.

I know I'm not so well to explain this matter. I tried my best. Thanks for reading my whole comment in patience