How do you control your emotions in stock investing?

My approach to investing is similar to when lending somebody money. I never put forward cash that I'm not prepared to loose.

We can control our emotions in stock investing by taking deciosions.

?????????????  If you ask that, you're not mature enough to invest money.

I started investing in the seventh grade.  Before I  spent any money my father gave me five rules that I had to know and had to have the discipline to follow them.  Without discipline one will never be successful.

1 -Know what you are doing, why you’re doing it and how to do it.2 -Have a written sound trading/investment plan with rules that will not only help you but more importantly protect you, mostly from yourself. And have the discipline to follow such a plan. Primarily never trade on emotions. Before you take any position, know when and where you’re going to get out.3 - Sufficient trading/investment capital. Use your own money, there’s no need to go into debt so that you can trade/invest.4 – Have a written money management program in place. Remember never invest 100% of your capital into any one security and never have 100% of your capital invested.5 – An understanding of the rules & regulations that govern what you're doing. 

Control your EMOTIONS?   Like disappointment or anger? or like joy and being happy?  If your emotions are expressed because you make good or bad trades, who cares?  If you're boss or supervisor is asking you to tone it down when on the phone with a client, that's different--but it's not what you asked. No one will care if your emotions come forth if they aren't your client.  They will only be concerned if it affects your work as a trader. 

You need to be able to foresee the situation before it happens. Then you'll know what to expect, so you'll manage to better control your emotions. Try certain platforms (say, eToro, StockTwits, NetDania, etc.) to learn possible fluctuations of the stock market. You could find out more here https://agilie.com/en/blog/how-to-build-a-trading-...

If you have a better understanding of this market segment, you'll feel more comfortable dealing with it.

It takes some self control. You are investing for an Eventual outcome in your favor, not a quickie on the next best thing. 

Read up, learn principles that are proven to work, and stick to those principles. 

You are trading, not investing.  I invested - some of it was invested 30 years ago and has not been moved.  

How do you control anything about yourself?    Self-discipline.

With investing, it pays to focus on logic and data. 

I don't have emotions in stock investing.  I research, study, and choose.  If down the road, I am unhappy with a choice, I change it.