Perfect example of what I was saying above about guys warped views. Ya, don't feel bad if you are indicating you are in the 6.5+ length range with your statement.
Larger than 87.8% of men using CalcSD study data (compiled and averaged from many studies to get the most accurate results)
Larger than 97.94% using Veale et al study 2015
Larger than 87.83% using Habous et al study 2015
Larger than 93.91% using Phosphine study data
So, yes, 6.5+ is considerably longer than the typical average lol. Definitely belongs at least in the big category as the OP stated (at least for length).
You can also use the link below to plug-in erect length, erect girth, and flaccid values. The end result will give you a total volume using EL & EG to give you an idea of your total volume. Flaccid really doesn't matter. It's just for shits. Whether it's a grower or shower doesn't matter. EL + EG will tell the true story as to the total volume (total size).
Example: One could be 8in long (very very long) but only 5in girth. I say *only* 5in b/c at 8in length that would seem somewhat small (though the actual avg is just ~4.65in EG). A guy who was 5.75in EL but had 6.5in EG would be 2 times the volume of the average penis. The former 8x5in example is only 1.6 times the average penis volume (315.8ml vs 260.81ml). For reference the average erect penis volume is 158ml to 163ml (e.g. ~5.5inx4.65in)
Link to calculator and study data from CalcSD compilation of various scientific studies