Is it okay to write like this?

Do you know what "although" means? It means that something unexpected occurred. If you don't go to university (oops, I mean "choose not to pursue university life" - never use one word when five will do) one would expect you to get a job (sorry, I mean "decide to start a career first in order to get acquainted with my skills and interests.") I think it's just lovely that you got acquainted with your interests. Indeed, only a churl starts a career for money or security. The real reason for getting a job is to get acquainted with one's interests. "Hello, I'm your interest in pornography. Glad to make your acquaintance."

Yes, but you will see one alternative in the answer to your similar question.

Thank you everyone :D

This question has already been answered. How many answers would you like?

It's over-formal, and as so often happens when people try to be too clever, it fails.

Make it simpler, and follow what John P suggested. In addition, change the tense of 'is' in the last sentence:

... I decided that it WAS time to ...

The use of "Although" at the start is wrong, in front of a bare statement such as "..., I decided to.....".

And "Now that I have become familiar with the work that I do, I have decided that it is time to...." Actually my idea is almost as awkward as your notion, but yours is definitely wrong.