Learn English – What do you call someone who believes in ghosts

Perhaps self-absorbed

absorbed in one's own thoughts, activities, or interests

or egocentric

regarding everything only in relation to oneself; self-centered; selfish

or self-centered

concerned solely with one's own desires, needs, or interests

SUPPLEMENT

Also consider self-directed

(of persons) free from external control and constraint in e.g. action and judgment

Note that this term is often applied to someone who does attend to the needs of other but exerts a good deal of independence in doing so.

and autonomous

Not controlled by others or by outside forces; independent

You are a bodhisattva. From the Wikipedia article about the concept:

In Buddhism, a bodhisattva (Sanskrit: बोधिसत्त्व bodhisattva; Pali: बोधिसत्त bodhisatta) is an enlightened (bodhi) being (sattva). Traditionally, a bodhisattva is anyone who, motivated by great compassion, has generated bodhicitta, which is a spontaneous wish to attain Buddhahood for the benefit of all sentient beings.

From the Wikipedia article on Buddhahood:

The bodhisattva attains liberation and wishes to benefit as many beings as possible. A bodhisattva who has accomplished this goal is called a samyaksambuddha. A samyaksambuddha can establish the Dharma and lead disciples to enlightenment.

The term has very specific religious meanings, but it is fairly broadly known nowadays as someone who has decided to direct their enlightenment to benefit the world, rather than dissolving in nirvana, i.e. removing oneself from the world. I would say it is popularly understood as a concept rather than a religious doctrine.

However, I would not go around just calling myself a bodhisattva without irony or at least comparative qualification like "I think my personal drive is what is described in Buddhism by the concept of Bodhisattva."