In the Quran, Surah An-Nur(24:58), Allah says:
'O you who have believed, let those whom your right hands possess and
those who have not [yet] reached puberty among you ask permission of
you [before entering] at three times: before the dawn prayer and when
you put aside your clothing [for rest] at noon and after the night
prayer. [These are] three times of privacy for you. There is no blame
upon you nor upon them beyond these [periods], for they continually
circulate among you - some of you, among others. Thus does Allah make
clear to you the verses; and Allah is Knowing and Wise.'
We are all aware that once a person reaches puberty, he/she is considered an adult and should be treated as such. For those below that age, the above ayah makes it clear there it parents should teach them the concept of privacy as to instill in them modesty .
Based on the above ayah many scholars including Ibn ‘Ashoor, Ibn Sa’di and Abu Bakr al-Jassaas recommend to cover the awrah of oneself and even small children so that that will be like second nature to them when they grow up. Children as we know are very impressionable at a young age and their character is greatly formed when young.
Indirectly connected to your question is another important Hadith:
Narrated Bahz bin Hakim: "My father narrated to me from my
grandfather, who said: 'I said: "O Messenger of Allah! Regarding our
'Awrah, what of it must we cover and what of it may we leave?" He
said: "Protect your 'Awrah except from your wife or what your right
hand possesses."' He said: "What about a man with another man?" He
said: "If you are able to not let anyone see it, then do so." I said:
"What about a man when he is alone?" He said: "Allah is most deserving
of being shy from Him." (Tirmidhi - Vol. 5, Book 41, Hadith 2769)
Sister, I'd also recommend you to seek the same advise from your mother or elders as they would know your situation better than anyone of us on this forum. The above references are from an Islamic perspective which you can share with them and take advantage from your elder's wisdom.