How to separate the ringer and notifications volume from the media volume

Hey community ;)! So i think my problem vas a very easy solution, i just can't figure it out. So i got an IPhone 14 plus on April and i'm in love with it, but everytime im going into an App like TikTok and i lower the volume with the lateral buttons because i dont want to watch the video with a loud volume, it also affects my ringtone and notification volume, so at moments i cant even hear my phone ringing or at moments it sounds super loud. So how can i separate these two things? I had an iPhone 8 Plus before and i never had that problem! Please help :(