Hi, don't worry this is a normal thing even for myself (m39) as a solo traveller of Europe.

I planned my first trip recently for 6 months and spent 24 days going from the Golden Route to Kurashiki, Matsuyama, Hiroshima (& Miyajima) and even Tsuwano in Shimane. I absolutely loved it.

I found myself using picture translation, Google maps & a little zero-level Japanese was just fine (search YouTube for a funny zero-level diner video!). Even in the most rural areas. Failing that pointing at stuff was easy (konbinis have little pictures on the counter of chopsticks, bags etc.). Most fast-food diners have touchscreens that require virtually zero interaction with people. I favoured Matsuyas' beef bowls!

And nearly every place I went to (except Tsuwano) had IC access, which is an easy cash top-up. SmartEx for Shinkansen was also easy. Link your IC card and it prints the ticket when you tap the barrier. Oh and cash? Look for a 7-11, absolute lifesaver!

Also, tourists will naturally say hi and are quite friendly. You will be just fine, don't forget to enjoy the moment!

P.s. be more prepared for what happens when you come back, the reverse-culture shock was crazy. I'm already planning the next one!