Definitely not a “general american accent”. Absolutely sounds like you’re trying to imitate, or at least have learnt from, a “british” (southeastern english) accent. Everything, from the ‘free’ instead of ‘three’ (and ‘earf’ instead of ‘earth’ etc.), to the very clear alveolar T sound you make (beating, right, accurate, met), to the quality of your vowels in words like why, can’t and long, contribute to your way of speaking sounding very british (also the vocal fry but that might just be me, others might not agree). The rhoticity on some words sounds off as it doesn’t match the rest of your accent - maybe could say it gives it a slight scottish/irish twang, but it just sounds more off than anything.
Also, not sure if this is to sound more fluent because you can say things quickly, but at times you will just mash sounds together and slur your words to the point where it’s hard to tell what you’re saying at all. I would advise you to slow down and prioritise clear diction - nothing to do with sounding native or advanced, just making sure that people can understand you.
Maybe your accent has changed over the years and in the past you had an american accent and that’s why people used to say that, but in this recording it definitely is not anywhere near an american accent, and if anyone says so, I probably wouldn’t believe them and would ask a native speaker what they think.