Must I go through RCIA?

i was baptized and cofirmed in a methodist church, later in life attended catholic school, got interested n had alot of answered questions. after that i had no need for the methodist church any longer so did not attend. later again more recent i found myself in a christian rehab w a catholic church nearby where i would attend mass. i was told all i needed to do was a confession etc like i did in catholic school, its like i am catholic now almost or what ? i really dont understand, i would like 2 be considered tht, its also a part of my heritage i found out, i hav my great grams rosary beads etc…what would be required of me 2 make it so i was catholic? because i practice and identify with the faith and heritage aside from actually havin a church? i also would like to kno if seminary was possible for someone in my circumstance?..

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