Of course you're disappointed. Good investment opportunities are only obvious in hindsight. There are just as many opportunities available to you today - you just can't see them until you've missed the train.

As of now there are several altcoins that may end up serving a good enough purpose to warrant investing in them today, and there's no telling what problems that BitCoins are going to end up having, and if a replacement is going to come along that will end up solving those problems. In addition, nobody can say for sure how much further BitCoins are going to go from this point, so some might even argue that investing in them today may be a good idea (though don't take my word for it - do your own reserach before deciding to put your money into something).

Cryptocurrencies are currently in an early adopter stage, and if all things go as planned, there's lots more to come.