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You have a very good situation: a job that you enjoy and a very short commute. Commuting a long way really sucks in many ways, so think twice before you do that. About switching jobs every 2 years, that is really often. I don't think 2 years is the norm. But it is a fact that people who switch jobs, get paid market value, while those who keep sitting, get raises smaller than their market value. Then it is time to find out your market value and talk to your boss about why you need a raise. If I were you, I would also think twice about changing jobs, as you enjoy your job so much. Maybe you have the kind of personality that thrives in many jobs. But in many cases, the gras in another job is not greener than in your current job. Also, don't count your current job as secure. I have experienced several things in my life that I thought were as secure as the bank, but that weren't. No job is ever secure.
Are there options for you to increase your income in some other way? As you have such a short commute, do you have time for a side hustle? Could you do someone else's gardening, as you like to work in a garden? Maybe help some old person? Can you do paid overtime at your current job?
About getting a car yourself... You have a 20 minute scenic bike ride to work. So, ride your bike to work. The environment will appreciate it, as well as your wallet. If you ever need to use a car, use Über or see if you can join a car share program in your neighbourhood. Owning a car costs a surprising amount of money. Don't do that if you don't absolutely need it and and want to save money. You do not need to help your family with buying their old Mazda.
You will find a similar post about buying a house with several good answers here:
https://forum.mrmoneymustache.com/ask-a-mustachian/first-house-purchase-timing-advice-please-help!/?topicseen
...just adding to Linda's excellent post:
This calculator is a great way of judging whether you would be better off renting or owning, financially speaking. It's not the final word, but it at least address the question "does it make financial sense?"
https://www.nytimes.com/interactive/2014/upshot/buy-rent-calculator.html