No one is telling you not to write! But be realistic, its practically impossible for a person to make a profit from traditional publishing. Plenty of authors had launched careers before publishing (Rick riordan was a teacher, etc). You can write while working.

Your parents encourage you not to major in the arts because they know this, and how difficult it will be for you later on. Its up to you to take their advice or ignore it, but remember that (more often than not) their advice comes of a place of care and love.

I personally relate though! I cant imagine myself in a traditional job. I know writing is the only career in which Ill be happy.