Egolessness Isn't Nihilism
Egolessness is not the same thing as self-extinction. We do not cease to exist, but we come to know more about ourselves. Realizing that there is no unchanging self can in fact be an enriching experience. The path consists of working with ourselves so that gradually, by overcoming the various inhibitions, confusions and delusions of the mind, we start to develop more insight into our own nature.
When we look at ourselves in the present moment, we see all kinds of confusions and defilements in our mind. Yet the possibility of overcoming all that and becoming enlightened is a reality. Our own lives become enriched from having undertaken this journey. So it's important not to mistranslate this concept of selflessness or nonexistence of ego. To say that we do not exist at all is the nihilistic view, which the Buddha rejected completely.
The Essence of Buddhism: An Introduction to Its Philosophy and Practices by Traleg Kyabgon