Is the following sentence correct or not?
I[STRIKE]'m[/STRIKE] sometimes watch[STRIKE]ing[/STRIKE] your video to make myself happy.
You need the present perfect (not the past simple). Do you know why?I've watched your YouTube channel since I was 20 years old. Your vlog and posts not only cheer [STRIKE]myself[/STRIKE] me up, but also cheer [STRIKE]people[/STRIKE] up many other people around the world.
That's one of the uses of "since".The word "since" connects the past time to the present time. [STRIKE]perfect tense.[/STRIKE] If people [STRIKE]have to[/STRIKE] use "since", [STRIKE]that word[/STRIKE] they must [STRIKE]be connected to[/STRIKE] use the present perfect.