I cannot tell you what swing speed you have, as there are a lot of factors which determine a swing speed. What I would say to you, is go to your local Golf shop or pro that has a launch monitor and get custom fit, it is free and very effective.
But, if you cannot do this, I would say your swing speed is between 85-90 mph and should therefore get regular shafts. Steel is also ideal for you. It depends why you think you need stiff? You are still young, and the only tell tale sign you should get stiff is if you are hitting the ball left (this is an indication you are swinging faster than the shaft allows the club head to square). On the other hand, if you got stiff and were hitting it right it would be an indication the shafts are too stiff.
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