I know im young, but im also a gifted child, my mind set and maturity level is drastically higher then most 14 year olds.
I'm gifted as well, but that doesn't change the fact that we still have to go through adolescence at a reasonable pace. I was the same and pushing it lead to me having an existential crisis, even though I started around 18. Trust me, you are not the only one who thinks they are mature for their age - the point is that even if you are right, you are still much more vulnerable than when you will be in a few years. Gifted people are often especially sensitive by the way, which is often one of the things that enable them to do what they can do. This sensitivity makes it even more potentially risky.
Don't underestimate this, the ability to learn and develop very fast does not make us superman. It is pretty dangerous to neglect that emotional development has to keep up and for this to stay integrated and on track we need to go through natural life experiences, to have stuff happen to us that cannot happen in a trip.
I urge you to limit yourself to soft stuff that doesn't have a big impact and to wait until you at least finish high school. Assuming you will attend college, the situation is much more ideal because you will have at least some of a basis of a naturally developed sense of identity, there is less or no clashing adult supervision and you will have laid a foundation of getting through a school even if you are not sure yet what you are doing it for.
What's the hurry? It must be impatience, (maybe some hubris), and the inability all of us often have 'to see how we can get through something unless something happens NOW'. There is no loss if you start at around 18, there is still plenty of time left after that and at least you have some naturally developed sense of self to go on before you start defragmenting it all through desintegration and reintegration.
In my opinion, if you are as mature as you say you will see the sense in what I'm saying (out of experience no less), if you decide to ignore it don't you think you should have a very good reason to?
(Also, I am not trying to patronise you... children / young people can be really paranoid about that :D I mean what kind of ill-conceived reasons do you think older people have to urge you to stay away from certain things?)
I am 28 now by the way, and I've pretty much tried it all. Psychedelics changed my life, my second psychedelic experience ever was extreme and it changed everything for me. A lot of the friends I have, in particular the ones with high intelligence, went through similar stuff. I felt it was important and while it messed a lot of things up for me it also gave me a lot. People who say you can get stuck in a trip are only talking 90% bullshit, it is way to simplistic to say it like that but there are definitely real risks of changes that end up being more than you bargained for.
I am incredibly grateful that until 18, I sticked to some minor drinking, some weed-smoking and some herbal highs. A bad trip would be the least of your worries. Mushrooms are not a lighter alternative like some people seem to suggest here. They were absolutely the most hardcore for me, they were wat changed my life the most and they are a full-strenght psychedelic like LSD is.
So like others that posted before me I fully empathise with your reasons to want to do it. But wanting to use these as a tool instead of fun is an even bigger reason to be responsible and wait. If you succeed and the questions about who you are and what you want to do get addressed you have no idea what you could potentially get yourself involved in. These are deep questions and you wouldn't believe how deep that stuff can go. Being gifted may only enable you to go even deeper with that which can be very confusing and destabilising to your life.
Don't get fixated, find some alternatives that don't have the potential of real classical psychedelics such as LSD, but that are still plenty interesting to do for a few years. Also I wouldn't mess with MDMA (ecstasy) so early in your brain's development. Not sure but you might potentially risk problems later on such as depression and other issues. You may not understand that it would be hard to just stick to doing it one time.
(also, don't people usually go to high school at 12?)