Oh, how we all agonise over this! I do understand, because like my grandmother before me, I was going grey in my 20s, and had highlights added to try to hide it. By the time I was 35 I was almost entirely grey, and the technology did not exist then to dye my hair.
I was sad for my daughter, who was asked whether 'Granny' was picking her up from school. Now, the genes are doing the same to her.
I couldn't afford my lowlights, which darkened my white hair with grey, after the end of last year, so I let them grow out. I had my already short hair 'roughed up' in a very short and spikey cut, which is brilliant for washing and 'styling' and sends out a very modern message. I feel I have grown into my sparkly white hair now.
I think perhaps the most ageing thing of all is the worried look we get from being bothered about it! Lots of good friendly advice here, but it is really all down to what is going on in our own heads. Accept whatever you feel is right for you, Leah11, and you will smile and look great. Good luck with it.