I don't presume to understand Buddhism very well, but I'm trying to increase my understanding of the Dhamma, so please don't take what I write the wrong way. I'm not being disrespectful, because even the Buddha praised Sariputta for his unwillingness to accept teachings on faith alone, but rather from his own personal experience and understanding.
I sometimes feel like Buddhist practice is a slow form of suicide. Gradually, all interest in life, the world, family, friends, romantic interests, sense pleasures and even love itself needs to be ultimately abandoned and renounced. Nibbana is considered to be the ultimate freedom and highest happiness because it ends all suffering by extinguishing the mind from all forms of existence forever. This is denied as being annihilation because its argued that since there was never a true self to begin with, there was nothing to be annihilated. Nevertheless, we still experience a subjective experience of a self, otherwise, there would be no point in practicing the Eightfold Path.
Because only a deluded (unenlightened) mind could have any motivation to extinguish itself, craving Nibbana seems very much like a strong aversion to existence. Anyone who tries to logically extrapolate this to justify suicide as a means to accomplish the same result is denied because its argued that a desire for annihilation (via suicide) creates more bad karma which causes rebirth. Yet, desiring annihilation via the Eightfold Path is somehow exempt from this. If someone wants to remain in Samsara forever, it's very easy to do, no effort is required. But if someone craves to permanently self-destruct via Nibbana, they must be highly motivated and diligent in their efforts, perhaps spanning many lifetimes. Some people even abandon all worldly life to become monastics to accomplish this in the fastest and most direct manner possible. Thus, it seems that to remain in Samsara requires much less desire and effort than to seek one's own annihilation via the Eightfold Path.
Again, I realize people will argue that you can't annihilate what doesn't truly exist, but this existence which all sentient beings experience as subjective reality is all a deluded mind can ever know, so seeking to extinguish that reality seems like a desire for non-existence which is supposed to create more bad karma and rebirth. I honestly struggle to follow the logic of this.