How can i get lubricant?

a lubricant would really be useful becoz im kinda dry down there and u know...the stuff. i would buy it but im so embared and im 13...im way to embared to buy it! the shop keeperes fken know me and...i dont want to let them know about my private life...i would talk to my mom about it not even if id be dead! she doesnt understand anything about what i do and stuff...my uncle...would tell my fricken mom.how can i buy some fricken lubricant?thats all i need! and its so impossible to get!