You know beamish boy, I really do like kids like you.
I know a thirteen year old girl who is completely in love with the Bible.
She reads it every day, puts off other little wants in order to read it, and feels awful all day until she gets around to it.
She is an inspiration to me XD
You sound like you know your stuff too though.
The thing about the book of Hebrews is that it may or may not be Pauline.
It doesn't say either way in the text of the book, so it's best not to get too dogmatic either way.
Eusebius thought it was ambiguous and so did other writers of the 2nd century, so if people were confused
then, they are sure to be absolutely baffled today XD
The big reason why I would choose, if it were up to me, to keep Hebrews is that it gives an example of how we New Covenant people are supposed to read the Old Testament.
I, personally, am a scholar of the Old Testament.
I loved the Old Testament and the Old Testament God even before I loved Jesus.
(No, I'm not ethnically Jewish, I just loved the Bible.)
As such though, I really appreciate the Hebrew epistle as it gives me a "starting point" in interpreting the Old Testament by the standard of II Corinthians 3:13~16.
In fact, I bet that a lot of what was said in Hebrews was spoken by Jesus on the road to Emmaus.
Of course, I won't deny that there are some difficult (understatement) passages in Hebrews like the one that
seems to be saying that if a Christian sins he loses his salvation forever.
But for the moment, I'd rather try to understand what I don't like in the Bible from every possible viewpoint before chucking it

Otherwise, I'd have no problem with, like Martin Luther, holding the book of Esther in total disdain.
Now, I quote St. Augustine to show what my approach is toward stuff that bothers me in the Bible,
"
Credo ut intelligam:" 'I believe in order that I might understand.'
But I hope you don't feel left out because of your age.
It's an awful feeling when people ignore you, but all you have to do is talk louder and
make them listen to you
Good luck!