You generally aren't going to count every circle in a stream (unless you're really talented, then have at it).
If a stream is following the drumline, it's probably going to stop at the end of a measure (I'm not a 'music' person so forgive me if I'm using the wrong word). If a stream is following the piano, or something else in the song, you just need to follow it until it ends. Having experience with streams in other maps will help you if you're sightreading (playing for the first time).
I don't think it's possible to give any helpful advice other than "play more". Get experience. Make mistakes. Retry until you get it right.
confidence and practice. you need to trust yourself you are going at the right speed in terms of movement and clicking, and practice in order to actually be able to know that you are doing it at the right speed.
and that's why i have no gf
as long as we have circles to click, no anger shall harm us
I also had problems with streaming some months ago, and i still sometimes fail at them (although they are not longer my nemesis ;3)
My personal tips are:
1) get faster enough at reading so u can pay more atention to the music instead of looking at the circles.
2) Listen to the music and try to press the key with the music, not with the circle animations, cause they are really confuse, especially at low ar.
3) play a lot of maps with triples on them. At osu!, as u play, u memorize the techniques, so u dont have to improvise the triples, but u do always the same movemente. If u learn to do triples properly, streaming is exactly the same, but longer.
Good luck man. When u learn to stream once, u learn forever, like riding a bike. Trust me.
Knowing how to count is pretty important. With that knowledge of how each division works you will know which finger to start and end on, which also helps to keep timing and pace. Believe it or not, it's not all about going sanic speed.
In a few weeks' time I went from not being able to play 5-note bursts to passing shit like calamity fortune
I JUST PLAYED MORE PLAYED MORE MORE MORE MORE MORE MORE OMAREPLRAFDFGJDSNF
and on another note, I read all the notes. Not individually, but you kind of have to read the notes to get the count of clicks you're gonna have to make. This came naturally to me, not sure if that's going to happen to you - I almost never click an extra note or miss the last one.