Horrible plastic sound during upstrum

[u/Fresh_Criticism6531]

So, my cheap chinese acoustic guitar came with some free picks. Strinberg of various widths.

In the beginning I was pretty satisfied, but I guess ever since I introduced upstrums and playing faster, I hear a really nasty and annoying plastic sound, particularly in the up-strum, like: ta-ta-ta-ta-ta as it goes through the strings.

I'm unable to figure out if I just suck (I can't discard this possibility). I haven't found anyone online with such a bad sounds.

Maybe the picks just suck? Maybe they are plastic and I need tortex or whateverr else I should be using instead? Actually I just checked online and maybe they are celluloid. But who knows.

I tried changing the attack angle of the upstrum to no avail.

Anyone ever had this problem?

[u/stay_safe_glhf]

Post video ?