Hmm, well I am finding it hard to believe you are a 15 year old who can run a 10.9 and a 4:04 1500, to be honest. Especially when you throw in your long jump as supposed bench press.
But assuming those are true, then you are at the level of an elite decathlete in the 100, 400, 1500, and almost in the long jump.
To put it into perspective, you would be in the middle of the pack at the US olympic trials in the 100 and 400, be not the worst in the long jump, and usually be the fastest in the 1500. The 1500 is what makes it hard for me to believe in combination with the other marks.
Which is why I doubt you are telling your real PRs, because they are just a little too good to be true. At the same time, there have been guys close to that at your age, so maybe it is true. One example would be David Klech. He went on to be a bit of a flameout in the decathlon, but that isn't really the point.
The point is that if these marks are legit, find a pole vault club in your area and a hurdle coach and start working on those two events. Those two will be the most telling if the decathlon is for you. HJ and the throws will fall in line if you show potential in those two skill events.