I wouldn't lose any sleep over it. There is another thread about cyclists not waving or saying hello to fellow cyclists. It's all relevent. Some will wave, some will ignore you. Some will have all the gear and brand new 3 grand bikes, and won't acknowledge anyone else who doesn't ride a bike worth as much as theirs.
On the other hand, there will be fellow cyclists who ride a BSO and will ride along with stupid grins on their faces, and will wave and talk to anyone.
Just enjoy your ride and if along the way someone acknowledges you, then you will have a win win situation. And well done on achieving your first 50 mile ride.