I'm 17 and my back is really hurting from my golf swing, what should I do?

I'm an avid golfer and swing every day, even if I'm not at the range I swing my clubs in my back garden at least 70/80 swings a day. I have a dream of turning professional but recently my lower back has been hurting quite alot. I have been told I have a really great swing but I think my flexibility is causing pain to my lower back. What should I do? I don't want to stop hitting the ball well but I know I could cause myself some serious problems later in life. Thanks.
 
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