Correct sentence would be "Nie lubię mojej prezentacji". Look at page 150: https://www.docdroid.net/K5bFCXa/lessontotal.pdf.html
Business context - sure, but it's normal here in education context as well. But that's rather what students prepare, not the teachers. And I believe that the same should work in English, although of course I'm not sure...
"lecture" (wykład) sounds a lot more serious, so it should be by an expert or at least a teacher, "demonstration" (demonstracja) would be demonstrating how something works, so also a bit different.
"podobać się" is one verb, which is reflexive, and "podobać" without "się" does not have any meaning.
And the way this verb works, you need an object in Dative to say 'to whom the subject is pleasing' (because grammatically this works like "My presentation is not pleasing to me"). So this is "mi", the Dative form of "ja".