are they really swollen lymph nodes on neck?

hi, i'm a 17 year old girl who noticed that i had 3 lumps smallish pea sized lumps on my neck, 2 on my right side and one on the right. i went to the doctor and she said they are moveable and probably just swollen lymph nodes that haven't gone down after an infection, but i've had them for years and i'm such a hypochondriac. i'm still not 100% sure they are lymph nodes even though i don't experience night sweats or itchiness. 

if anyone's ever experienced the same thing then i'd be really glad to hear about it and make myself better as i get really worked up about these things! 

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  • my gp has never said anything further than just to wait if they hat bigger which is the worst thing for me, i'm only young and have. a history of cancer in my family, it's frustrating when all they do is tell me to wait and see if they get worse, it's always just stayed the same, i just want a blood test or something done to reassure me