Are the new veins unhealthy? - 14 year old?

Hello! I am a 14 year old and I have been working out really hard the past 6 or so months. I also started track. I have always been lean and thin but since I started track I have only gotten more of both yet my strength has rapidly gone up. I weigh 126 and can bench around 140. I am around 5”8. I recently developed... show more Hello! I am a 14 year old and I have been working out really hard the past 6 or so months. I also started track. I have always been lean and thin but since I started track I have only gotten more of both yet my strength has rapidly gone up. I weigh 126 and can bench around 140. I am around 5”8. I recently developed new veins in my shoulder and top of chest. My older friend who has been working out much longer than I have said I should chill out and seem to be worried. Please please let me know your thoughts. Thanks!
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