Our Sun is typical low-mass star in the galaxy, in the prime of its life, steadily fusing hydrogen as it will do for another five billion years. For an overview of our Sun's and other stars' lives, check out Star Life Cycle. For more details, see Main Sequence Stars and Sol.
You have probably heard that the Sun will one day expand and consume the Earth. In fact, the Sun might even expand to the orbit of Mars. Read what happens when stars leave the main sequence here.