I've been masturbating every day since I was 13, and I'm now 19. I'm worried because I feel like it's making my penis smaller. Are there any supplements, oils, or exercises that can help make it bigger? Also, what precautions should I take?

It's important to note that masturbation does not affect the size of your penis. Penis size is primarily determined by genetics and natural growth during puberty, which typically concludes in your late teens. If you're concerned about your health or body image, I recommend speaking with a healthcare professional to discuss any worries and get personalized advice.