15, should I start T?

I'm 15 turning 16 this year and have been thinking about starting T for awhile now my only issue is that I've seen a lot of things saying I should wait till I'm an adult as I might change my mind later on and am to young to make these type of decisions as they alter me forever or something like that and if it's not that I should at least wait till I'm 16.. I really want to start but get a lot of anxiety about it because of stuff like this also I'm very scared of needles so I was wondering what gel brands are the best to use