boyfriend compares me to his sister?

I've got a strong relationship with this guy, we have been together for 2 years now, but he still compares me to his elder sister from time to time. When she's got a red jacket he says that I should get one too, when she goes for a run he never omits telling me that i should start running too. I know he really loves his sister but this thing comparing me to her all the time just pretty gets on my nerves. Me and his sister are way too different and I dont know if I should get offended or just get used to it and live with it.
boyfriend compares me to his sister?
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