whats surprising is that parents let their kids do ochem at 17!! thats some toxic shit :). safety is why chemistry is not a super popular field at high school level science fairs.
First, what would such a mark be like for you? Is it something you could plausibly achieve with all the resources within your reach? Is it well-defined or is it nebulous? Is it likely to remain stable over the time you would require to achieve it, or is it more defined by the whims and fancies of the world which seemingly change every other week now?
Then, even if you did achieve it, how long would it continue to matter to you? Would you remain satisfied with it or could you become habituated to the achievement in a week, month or year and replace it another mark that would then become the one task you must complete before you die? Even if you did remain satisfied with your great achievement, would it really matter to you at the end of your life, or would you completely forget about it in the physical and mental anguish that many people seem to experience at the end of their lives?
And after you are dead, how long would that achievement be remembered before being supplanted in the public eye by something bigger?
And would it really make a difference to you at that point? Whether it remains a grand success for a thousand years or is forgotten in a day, you won't be there to know the difference anyway. It really only matters to you for the brief periods of time in which you're thinking about it right now. During times that you're distracted, tired, enjoying and appreciating something else or are simply asleep, it's hard to believe it matters at all.
If you're happy, healthy, not harming others, making a decent and honourable living, raising kids, I think you're already winning.
If the idea of having to leave a mark is making you unhappy, maybe it's better to just drop the idea.
apart from that: the word "mark" comes from a root for "boundary" or "border", and really it doesn't need to be about that; we're all in this together.