What are the symptoms of vitamin d deficiency? i have ongoing neck/shoulder pain, weak legs, fatigue and dizziness. are these due to the deficiency?

Possible: At your age (young) you should have bloodwork to check for specific markers. "bone pain" can be a complaint of deficiency but there may be other causes.

Few symptoms usually: Most pts with true vitamin d deficiency are virtually asymptomatic early on, and blood test levels often surprising. Do get this checked and monitored, but most likely, your symptoms are due to a different cause.