Why do I get those smiles :-)?

whenever i talk to people (stranger or known) i always get a pleasent smile and also they feel a bit happy talking to me... but... here is the confusion!

people of my age do not do that at all! and sometimes my frnds say i look ugly due to some acne scars!

so can anyone tell me whts going on?
Updates:
+1 y
i meant in person not in text!
Why do I get those smiles :-)?
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