At one point in time you will realise how stupid you were about wanting to inmediatly become/good/pro or top rank too fast, there´s no way around it and eventually you will become uninterested in the game if you continue with this. It is a rhytm game, play songs and enjoy them as well as the mapping styles, do some multplayer and maybe talk to peoplei, do not get frustrated over the game while also trying to learn. If you only find joy in accomplishment then will you have a bad day if you didn´t get pp? Sounds stupid to me now yet it sort of happened to me.
Just so you know, getting to be pro will take like 3-4 years or so, and even with that some people sadly won´t be able to get past a certain skill level. So get used to it and start to enjoy playing because even if you get there, you will then ask yourself what now? or why did i waste so much time crying about improvement when now i play for months and i almost stay the same?.. i know it´s not that easy but eventually we learn it some way or another.