People talk about vibrato being a thing that happens naturally but I have always gone out of my way to sing notes straight. Vibrato doesn't come naturally to me unless I choose to use it. Am I forcing vibrato too soon or is it something I should work at achieving?
If you can turn your vibrato on and off at will, then that's great. Not everybody can do that, so you have the best of both worlds.
Just make sure your vibrato doesn't sound forced or unnatural (get an expert opinion). You might need to work on controlling your vibrato.
Then all you need to do is decide where vibrato is musically appropriate.
Be in control of your vibrato. It's something you probably should be ABLE to do, when appropriate.
Some singers have a wide, seemingly uncontrollable vibrato. Maybe that is what you were trying to avoid? Others add a little vibrato during the course of a long note. That's a good trick to have available.
Take control. Not much 'just happens' in a performance art.