dread (?) periods a lot

i’m 14 and ive had my period 4 times, and i have this thing where like whenever someone says like do you wanna go out, the first thing i always think is omg will i be on my period then, and i always worry about being on my period when i’m away somewhere, but like i worry extremely. i dont think it’s normal and this might be because i tried to use tampons but they don’t work, meaning i probably will end up missing out on swimming and stuff.

does anyone know how i could stop worrying about it and get used to my periods? idk if it’s just normal because i’ve only started them recently or if i’m just a huge over worrier!