Samurai were human warriors of Japan's past, not mythical creatures. Could you contact the spirit of a Samurai? Yeah, but just as with any other spirit, there's always an element of you don't know 100% who you're talking to.
Zanikia, you do still have options. It is not exactly what you want, but you could study Japanese history, and learn the details of their late feudal system -- that is the era of the Samurai. The most dramatized era is near the end of Japanese fuedalism, when things were falling apart.
You could learn the Bushido code, and study Japanese martial arts, both armed and unarmed. It is steeped in Shinto, the most popular religion in Japan before Buddhism was adopted. Both continued to exist, separate and together, and still do.
At the very least, the spiritual aspects are worth while for finding your own path, and the history lessons and physical training can be beneficial.
But you are best with the martial arts to take actual training. Doing it on your own may end up injuring you.
The Samurai caste was routed and killed during the Meiji Restoration in the 1860's. There are no more Samurai. There are still those that practice the martial arts that the Samurai studied, and you can learn them. But, no, you can not become a Samurai.