The Overtime rule

I think the overtime rule in the NFL should be changed. I think the this rule should be change to u have to score a touchdown in order to win. For example in overtime if the team who gets the ball first kicks a field goal then the other team should get the chance to score a touchdown and win the game. But if they are not able to do so then the first team would be awarded the victory. I just dont feel that it was fair for the Steelers offense to get to the 25 yard line and just kick a field goal to win the game against the Titans. I think the Titans should have gotten a chance to score.