Mushoku Tensei: Isekai Ittara Honki Dasu

A 34-year-old shut-in dies after spending most of his life isolated from society, then opens his eyes as Rudeus Greyrat, a child born into a world of swords and magic. He retains every memory and regret from his previous life and decides not to waste this second chance. Rudeus shows exceptional talent for magic and learns rapidly under his tutor Roxy, but new family bonds and friendships also force him to confront fears he carried from his old life. For him, reincarnation is not simply a chance to become powerful; it is a chance to finally learn how to live.