I think it entirely depends on your past experiences. Let's compare two hypothetical experiences:
1. When Alice was 7 years old, she scraped her knee and started to cry. Her mom ran over and comforted her and then they went and got her a bandaid.
2. When Mark was 7 years old, he scraped his knee and started to cry. His dad yelled at him to stop being such a pussy and shut the hell up. He couldn't stop crying so his dad hit him.
It is pretty clear who is going to try to not cry going forward. You don't need to repeat what happened to Mark many times for him to learn that expressing how he feels in that scenario is not a good idea. Keep this pattern going long enough and you get an adult who is probably going to view emotions as a burden. As to whether expressing emotions is a good thing or a bad thing, it entirely depends on who you are expressing them to.