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!