We should index these sorts of threads because there have been so many replies to this question in the past.... enough so that after reading a certain number of replies (especially well worded ones, ones speaking from experience etc), it will probably hardly change the conclusion drawn and decision made up in someone's mind.
LSD is not more harmful or powerful, but it depends on the dosage how it compares with mushrooms which are qualitatively quite hardcore already.
That trips in the past have gone well already does not mean it's fine to trip at 14. There is no damage done but there is an influence on the development of your mind. Psychedelics are powerful catalysts / mediators of change. This means that you are playing the odds and may very well get that development 'off course' in some way that is impossible to predict or understand until much much later. The reason to start not until an age of something like 18 goes beyond being mature enough, maybe even beyond how well-formed an identity is before you start getting really deep and metaphysical etc.... IMO the greatest reason is that because you are still so early in your development there can be much more of a butterfly effect: any significant experiences and changes affecting your development now will mean that you will keep developing for quite a while in "abnormal" ways.
That there can be positive changes is besides the point, at 18 you are still early enough for such changes to affect the rest of your life but at least you will have some more or less stable foundation (if everything goes right)... there will still be so much time (like in your twenties which is when most trippers experiment a lot) that doing it now is just nothing more than irresponsible impatience and a lack of a mature perspective that lets you weigh the relativity of things and the consequences of your actions.
I did not trip until I was 18 or 19 myself and I was happy about that because of how psychedelics have affected me (in many ways ranging from very bad to very good to immeasurable) over the years.
Having had good trips thus far does not guarantee anything about trips yet to come, regardless of whether they are on mushrooms or LSD... just as the countless trips I have had thus far do not make me immune to going into some drug-induced episode (just as an example). That mushrooms are heavy for a lot of people does not mean either that therefore you can handle anything. For some, LSD is much heavier... it varies.
These are not toys and it has nothing to do with how mature you are or aren't for your age (well I mean, that's only a small part of the matter).
@SSRI's:
Do not assume that there is no interaction. The effects you notice directly from the interaction vary between people, per SSRI and there are various other factors.
SSRI's may in part work because after having taken them for a while (usually some weeks) action of the SSRI on 5-HT1A autoreceptors in your brain cause your synaptic serotonin levels to increase. Suffice to say that the effects on psychedelics are related closely enough that there may be influence on how effective the SSRI is... something you may not notice directly, is not well researched and is again unpredictable.
Lastly: while SSRI's get overprescribed, the reasons leading to you getting them prescribed may also indicate that psychedelics could be risky in other ways.
14 is not an age to fuck with your brain in unforeseeable ways. Damage like how we normally think of damage, is not the right way to think about this. This is about disruption of your developing brain and the risks you take with what will be the natural baseline state of your brain when you are an adult.
My ex took an SSRI since when she was quite young and now she basically can't off them anymore decades later.
