How to start therapy?

Ive always known i have a personality disorder. Whether it be my relationships, friendships, or social behavior and reactions.I have sh before (2 years clean)but only a few close friends know of it plus ive had intense suicidal thoughts on an off for the last few months. Around a month ago I began reading about bpd. No matter how hard i try to reason im pretty sure i have some form of bpd. Ik self diagnosing is a big no when it comes to psychological disorders. However im afraid of coming out about this this to my parents and going to therapy (17f + pretty conservative family). Is there any way in which i can convince my parents for therapy.