Greek is my first language and Ive (tried to) read Latin, unsuccessfully, meaning no words maake sense to me when I view them from the perspective of "this word could have this greek word as a root"
Yes, but you can for the most part understand ancient greek if you know greek. Ancient greek and greek are similar enough for that. Greek and latin are not.
Yeah, after about 1000 years even the exact same language normally will change so much that it's not understandable to speakers on opposing sides of that divide. I can't read much German, but in reality German and English are very related and with some explanation one can see it pretty clearly. I agree with your sentiment I think, but "nothing like" is pretty absolute.