Should I be a sister Missionary?

I am 14 and had joined the Church of Jesus Christ of Latter Day Saints in July and recently i was asked if i would be a sister missionary. I don't know whether i should because have no scripture knowledge, i dont think i could go on a mission because i am really nervous around new people, i am very worried about uni and and settling into a job, i fear i'd accidently fall from grace without realising it and i worry about not seeing my family. I dont know what to do and i need just some serious opinions not just whatever you thinks best because i dont know whats best (not being mean because i know its a personal choice but id like some more honest straightforward opinions plee!)