Rina hi there ^^
To answer your questions, yes my parents are accepting of me being trans, but always instilled the value in me to save myself up not exactly for marriage, but for an impirtant other person. So i came across chastity myself, but actually got my first cage together with my partner, who shares my values. š
Also my parents are aware that i am chaste, but not exactly involved in it, but they do support me.
Plus the cage, and hopefully sooner then later the belt actually help with my dysphoria as well.
And for your second question, its more a sign of fidelity for me. And also that i do not fully trust myself to be unlocked.
Hope that answers your questions, but youre always free to ask more ^^ am a pretty open person