What is the Average 15 year old penis size with erection?

I am very worried about my penise …. I hit puberty when I was about 12…. I have pubs but not very much I am very worried because I'm afraid my girlfriend will think its small and start gossip or whatever :( when I have a erection I'm about 3.5 and this clear sticky stuff which I think is pre- *** will come out… Not any semen … Will somebody please explain if this is all normal or not
Thank you

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