There will always be negative comments and remarks around you.. People are just not fond of change, most of the time. I've found that when you are ready for change, you should do it for yourself. The negative comments will mostly fade after some time, and after about 1 month they will nolonger comment In fact, chance is that you will hear positive comments

And looking by the coverage and density you already have (not to mention the color ) it's going to be no problem man! Just grow it!!