Lost In My Mind by The Head and the Heart
Because we forget Jax is young man and a kid when the show starts and then he faced with being a single father. At the same time he begins to become more involved in the club and begins to fall in love again with a woman who doesn't want him in the crime business. But his family is the club and he has no other choice but to stay even though want a quiet life with Tara and his sons. Also even though Jax says he wants out of the club, we can all see he having trouble imagining a life without his brothers.
He's Lost In His Mind as the song states.
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