My heart really goes out to you.
I’m a teenager, go to the Ordinary Form mass most of the time and have been receiving Communion on the tongue while kneeling for about seven months.
I go to Mass with my grandmother (my parents only go to Mass at weddings and funerals) and she has no problem with it.
I’ve had two incidents with family about it though:
First, at Christmas I went to Mass with my other grandmother, who holds some liberal positions on the liturgy (she goes to ‘Mass’ at a ‘Catholic’ womynpriest congregation). After she saw me do it, she tried to convince me that I was too smart to do it.

She said something about how the Church only did that because people were too dumb to understand the Eucharist.
Second, apparently she told my Dad because when I went to Mass with him for a family occasion he told me to “receive the Eucharist the regular way” because not doing so is “embarrassing.” Fortunately, he let me receive on the tongue while standing (which I did). I then proceed to let him know that receiving holy communion on the tongue while kneeling is the “regular way” and special permission is needed to do it any other way.
In the end, I can’t make any suggestions for your situation but I can say that if my parents didn’t say not too (but only made fun of me for it) I would continue to do so. Who cares what they say? How you receive Holy Communion is between you and Jesus and whatever makes you most comfortable should be what they care about.
Never mind, I can make a suggestion: maybe if you positioned yourself in the pew so that you’re the last person in your family receiving they’ll be too focused on their own communion to notice you.