But who has any right to find of existence in present

In different contexts:

Individual Perspective:

Some individuals may find meaning and purpose in their existence through personal experiences, relationships, accomplishments, or spiritual beliefs.

Cultural and Religious Beliefs:

Cultural and religious frameworks often provide a context for understanding existence. Many religions, for example, offer narratives and doctrines that address the purpose of life.

Philosophical Views:

Philosophers throughout history have explored the nature of existence. Existentialism, for instance, emphasizes individual freedom and choice in creating one’s own meaning.

Scientific Understanding:

From a scientific standpoint, existence is often explored through the study of the natural world and the universe. Scientific theories and discoveries contribute to our understanding of the origins and nature of existence.

Social Constructs:

Societal norms, values, and cultural constructs also play a role in shaping how individuals perceive their existence within a broader social context.
Ultimately, the question of existence is subjective, and different people may find meaning and purpose in various ways. It’s a deeply personal and philosophical matter that has been contemplated by thinkers throughout history. If you have a specific context or aspect you’d like more information about, feel free to provide additional details, and I’ll do my best to assist you.