You are not the only person in Lithuania. Maybe someone else wants to learn it. Primarily a small percentage of ethnic russian and polish families.

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I'm not sure how old you are, but choosing russian in 90ies and up to 2010 was done because knowing russian was better than not knowing it since it was akin to second language and was useful at job hunting.

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These days it's less useful due to russian warmongering cutting up bussiness ties but the main problem is also that Lithuania simply doesn't have enough teachers of other languages as compared to russian. Though given time and with the nature of how things go, that will change in the future as more and more youth focuses on other foreign languages and replaces aging teachers.