I think they are realistic for the most part. Your two year goals I think are achievable. A 2” gain in length will probably take you 10 years though others have done it in much less time. An inch in girth may take alot of work not sure if that will happen but others have done it so I would say that is achievable too.
I started at roughly 6”nbp or possibly just under (didn’t really measure) and I am now 7”nbp. My girth was 5” I think and I am now 5.5”MSEG. But I was very inconsistent for the most part and I started about 5 years ago. I really have only been consistent for the past 2 years or so.
And at 6”nbp length you are actually longer than average, from most of the studies I get the impression that 5.5”nbp is the average length. Your girth is dead center average from everything I have read. Definitely not a “small size”.