I am a 17 year old guy, very worried about this frequent erections which occurs every time, it occurs even with the slightest thought.how to control?

Normal...: Isn't testosterone fun? Erections are a normal part of life for a male and especially during the teenage years the frequency and timing can seem "abnormal" but I assure you that this is NORMAL. Controlling your thoughts and what you look at can go some way to helping stop unwanted erections, but whatever you do, erections will still remain a part of the adolescent boy's life!