You have made all the emotional decision while investing your money so this was suppose to happen. Your method was wrong while approaching the scenario but you can change that always. When you don't believe in the stuff that you are doing then you will never get the success for it. You could have turned your $200 to 400+ at the current rate and then could have reinvested it again. It could have given you nice path further. Anyway now you can put that money bitcoin or I will prefer altcoin with that low amount. Better keep an eye on ethereum which might be going down soon as the fork is about to happen. You can put the money there.
For me, I think whatever decision you made, either you didn't made it wisely or its already your plan to do the action but I know it was coming from the bottom of your heart. Feeling regret after not trading? Well you may feel regret if the price is hits its peak value but you didn't know that, so you didn't make to trade your coins. Feeling regret after not gambling? Well I also think that the feeling of being regreted is not already new to us, I believe that all things happen for a reason. Let's just face what is happening now and what tomorrow may bring.
All does really have a reason and those actions been made does really depend on us which we can say that this would really be on some cases depending on the situation why we did able to miss that opportunity.Feeling of regret is really there specially when we saw the price have pumped up and we did sell on earlier times but well we should not stress out ourselves as long we do gain on profits it would be still considered as fine thing.