If you are used to using Windows or a Mac, you are used to getting updates of the operating system much less frequently.
Traditionally it's been four or five years between operating system releases.
Many distributions of Linux seem to have a new one about every 6 months.
Why does this happen so often? In the Linux community there are thousands of things that upgrade all at the same time.
Sometimes the kernel has updates.
Applications are updated or even removed entirely and replaced by new ones in the distribution.
Functionality like hardware support might change from release to release.
New changes in the graphical user interface might have been updated needing a total overhaul of how some functions work.
Since there are so many factors many distributions choose to upgrade on about a 6 month cycle or at least once per year.
Do you actually need to upgrade that often? Just because there is an upgrade doesn't mean that you have to install the new version.
If you don't need a new functionality and are happy with what you are using, keep using your current version.
The only time that doing upgrades will be needed is if there is a security problem.
Any responsible distribution should patch these with updates as opposed to new version of the distribution.
This means that a new version of the distribution does not need to be right away as soon as possible.
Some distributions have LTS or long term support distributions.
Many of these have at least a three year support cycle.
This is because most companies tend to upgrade their hardware on a three year cycle.
Many distributions have cooperate clients that don't want to upgrade all too often.
If you want to, use a longer term version like this to avoid upgrading to avoid having to do frequent upgrades yourself.