People may think they are fighting the market, other investors or swindlers who are always looking at your money. In fact, you're fighting against yourself. Only you decide to buy or sell. So keep your head above water and don't complain.
There is a pretty good saying I still remember it means that if there is knowledge then gambling is also investment and no knowledge is invested as well as gambling. That means that if you want to be a successful investor, knowledge is very important so you should not invest just because someone is introduced.