When I came to know about Bitcoin and other crypto currencies, the Bitcoin was 500 US dollars and slowly it fell to 200 US dollars. At that time I could not invest any thing in Bitcoins so I missed the chance
How much could have bought back then? Don't beat yourself up over opportunities missed. Use that frustration to motivate you to find the next opportunity "at $200" so you can get in early next time. As for bitcoin, invest in it for what it is at this moment.