Some people always think bitcoin is expensive but it is not. For instance if 1 bitcoin is = $10,000 we will say it is too expensive and when we look at the price in next two years it can be double($20,000-$30,000) and we realize that bitcoin at $10,000 was very cheap and something very affordable. The future will always make us understand that bitcoin is not expensive, we only miss expensive opportunities that we won't be able to get back.
We should try to buy bitcoins according to the amount of money we have. If we have $10,000 but if we try to buy a bitcoin with that $10,000 then it's normal for me to think that bitcoin is expensive. I have to try to work in the position I am in. An acquaintance of mine drives around in a Lamborghini but my normal car does it but if I try to buy a Lamborghini from my location it won't. I have to change my position first and then when I feel like I can buy a Lamborghini very comfortably and maintain that Lamborghini with ease then we can overcome the regret of buying that Lamborghini.
The same goes for investing in Bitcoin, one should never follow others directly. The other person is investing more than you but you should consider investing as much as you can from your position. If I have the ability to buy bitcoins for $10 then that ten dollars is a lot of bitcoins for me.
If we are not satisfied with our own position, then following others will only increase our regrets and sighs which will do us no good.