Ugh, I shouldn't even have to do this, but I guess it's needed.
No it doesn't.
You grew up in the lap of luxury.
It also says you enjoy a life of privilege. Being a Templar is not a life of privilege. Yes, the Trevelyans are a noble family, but as long as they are Templars, that doesn't matter. They live within the confines of the Chantry. There are certain vows that Templars must take, but even then they have not been a part of the Chantry for years by the time DA:I starts, so none of what you're suggesting makes sense given the reason the Human Inquisitor is there.
Yes, you went to help your relatives...at the Chantry conclave.
That means you're there to assist your relatives because they are a part of the Chantry, not that you are assisting the Chantry along with your relatives. But as I said above, if you were a Templar, you wouldn't be there to help the Chantry either way.
You can be the youngest member of the family at any age. Big brother/sister is married with no heirs, middle brother/sister is in the Circle, and you are the youngest...
You're trying to act like the Inquisitor has somehow can be any age they want and already an inducted member of the Templar Order, when that simply isn't possible. It also doesn't fit with the backstory.
I'm not ignoring what is in front of me, just reading it differently to you.
I am however quite happy to admit that we can both be right. Depending on our own interpretation.
Anyway I've explained my take so that's the end of it.
No, we can't "both be right," the backstory is given so that the Inquisitor has no strict obligations to either side besides the ones they set themselves. That is why they are still young and not a part of either organizations at the beginning, the Mage Trevelyan aside since that is a group that one must join from early childhood.