On December last year I bought $AMC Entertainment (AMC.US)$ ...

On December last year I bought $AMC Entertainment(AMC.US)$ at 8, big mistake, It didn't stop decreasing since then, I lost an opportunity buying more at 2.2 this last month(too low) and selling at 5.5 this week(overpriced).

Last year, bought $Whiting Petroleum Corp(WLL.US)$ at 0.73, and $Gulfport Energy(GPOR.US)$ at 0.46, and sold them for 0.90 and 1.60 respectively on Monday 27th, after seeing them decrease during the weekend, the highest were on 23rd at 1.94 and 2.56 and they had another peak 2 days after too. Those were the most risky investments I have ever made (my speciality is biotech but saw the opportunity), I sold them after seeing myself trying to time the market and spending too much time on this.