This will not affect your original timeline.
And lets take take this hypothetical a step further:
Sceanrio 2:
Say, in the alt-timeline, present-you arrive in the year when past alt-you were 10 years old, your original parents/guardians/caretakers dies for some reason on this timeline, would you care enough about your alternate-self help them? Like take on the role of a parent/guardian in place of their now-dead parents? (Basically, its a roundabout way of asking: How much can you tolerate yourself?)
My answer:
I think I could probably remember enough of myself to understand my alt-self enough to become friends. But if their timeline got fucked up, and their parents die, I’m not sure I can actually deal with this kid who, is me, but not me, like… I would probably get so annoyed at this kid, but also, I’d think about myself when I was 10, when I was this kid, and then feel pity. Idk if I could ever abandon an alt-self, because I’ve already feel abandoned (not literally, but like as in terms of the emotional side of parental love that I never gotten), I wouldn’t wanna see someone who is practically me, also go though the same abandonment.
Idk… Time travel is so weird.
My 20y.o self cringed at my 15 y.o. self.
At 30 I cringed at how I was at 20.
Now at early 40s I cringe at the thought of 30 y.o. me.
In conclusion: I’m probably still cringeworthy to my future self. But at least my younger self can feel comfort in knowing that it gets better.
Im at step 2 of 3, and feel about the same. Do I regret what I did when I was younger, somewhat, it was just cringe until ~27… Would I slap the shit out of my younger unmotivated ass, absolutely.