Is it possible for me to get a native english accent? I started at 12

I started watching videos on youtube in English (no subtitles) and started using my phone, pc in english since I was 13. I watched videos over and over again even I don't understand it. I could barely speak at that time, then I can speak one or two sentences at the age of 15. Now I can speak fluently, but sometimes I make grammar and pronunciation mistakes (my tongue started to twist when I pronounce 2-3 words with "s" or "r" sound but that's a rare case). I understand most spoken english. I read everything in english even school study topics. I spent time on weekends mostly watching british TV series, read interested topics on the internet in english. I never go outside and meet new people as they can't speak english. My writing skills isn't up to scratch because I don't spend much time on writing. Is it possible to get native english accent or native english level?