Will my teeth whiten with professional in office dental whitening? (photos)

My teeth are very yellow and discoloured. I'm only 18 now and my teeth have been this colour since my adult ones grew through. I've always been so self conscious. I've never understood why they are yellow. It is because my teeth just grew through with no enamel? But if this was the case my teeth would be sensitive but they are not. Or is this just my natural tooth colour. If so can natural yellow teeth be made white with a tooth whitening procedure and how white will my teeth likely go?

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