GIRLS ONLY. untrained for first periodd?

Im 12 and all my friends at college hav their period but mee
And I'm REALLY worried that it might happen at conservatory
and i dont wanna be embarrassed
I also begin discharging like 8 or 10 months ago
is that any sign of starting term??
PLUS my mom and both my sisters started when they were 12 and Im 12, and im turning 13 soon, so im alarmed!
ppplease help
and do pantiliners hold any blood?
THANKS! wear a small wipe every day. JUST IN CASE!
i would wear a small wipe or panti- liner every day or bring one. only just cause u never know when it will come to pass. don't be worried mine happened @ a swimming pool.