^^what @NorthernMom61 said.
You have taken an huge leap - right into the deep end of psychological & physical distance from home. The cultural differences are at every.single.level of your day-to-day life.
Being overwhelmed by that is perfectly normal 
Do you have a structure- are you taking classes? are you part of a group? More info on that will help us give you some more practical things.
Setting up patterns helps a lot. For example, find a good neighborhood tonaktsu or ramen shop - and go there regularly (a lot- several times a week). They will quickly get to know you, you will get to know them. When you walk in you will have a greeting from another human and you will have food that has become comforting and familiar. Use your growing language skills with them.
Also, is anybody going to visit you in Japan? There is nothing like having a visitor from home come. It’s fun to see them, but it’s also fun to plan their visit, have things to show them. And, being honest, it’s really cool when they are impressed by how good you are at navigating your new environment. You might be aware of every language stumble you make, but they don’t even know it- they see you being able to handle the transportation system, knowing which in a row of seemingly identical ramen shops is the ‘good’ one, being competent when they are feeling overwhelmed. And you, in turn, realize that even though there is still so much you don’t know- you actually have learned a lot!