If you got frustrated from long period of red you do not know bitcoin at all. Do you think it's the first time so? Take a look on the whole history of bitcoin's ups and downs through decade and your frustration will disappear.
I guess again that OP could be a newbie in investment generally. The class of investors that always think investing brings profit immediately. Moreover, in 2017 was a time for bullish for investors who have waited for it and most cryptocurrency got to their ATH. That time will still come, we are in the business of ups and downs, if we go in at the right time, we won't feel the bear too much.
Therefore, this is a good time for investing.