You can talk to the priest in your parish. While the customs of Eastern Catholics and Orthodox include a big party surrounding the baptism of children (Usually ages one or two). He can discuss with you the reasons why you want to be baptized and also speak with your parents on the greater importance of the Sacrament and lesser importance of the party and public display. Your case is not the first time this would have happened, and the priest would know best how to approach the situation.