Is having a runner's build unattractive?

I absolutely love running. It’s my form of meditation. That said, I’m super thin. I have very much of a runner’s build and cannot gain weight for the life of me. My BMI hovers around 18 and I haven’t gained any weight in 3 years. I have to wonder if this build is unattractive. I’m not very bulky and am more tall and lean. I don’t have a huge appetite so even with lifting, I don’t put on much bulk.

Some people I’ve talked to said I should probably cut back on running, start eating more, and lifting more. But I really don’t want to. What do you think, is having a thin and tall build, a runner’s build unattractive?
Is having a runner's build unattractive?
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