I Think I Have Torn My Vagina (only My Second

I think i have torn my vagina (only my second time having sex) but I'm too scared to go to the doctors about it. I have researched it but everything I read seems to be different and its really stressing me out! A lot of things I've read said it should heal by itself fairly quickly but its been 8 days now and the last couple of days is when its been hurting the most! Why is it hurting more now when the few days after i had sex nothing was hurting? And what can I do to make it stop hurting? I'm not even 100% sure its torn, I have looked down there but it hurts when i touch it and I'm 90% there is a tear. I bled quite a lot after i had sex, and then i must have started my period because there was a lot of blood but my period is now ended and now I get some brown dotting in my pants. It hurts when i go to the toilet too. Im also worried could it possibly be an STI? However I have searched up symptoms for that and it doesn't seem to link up. I'm also worried that if it is a tear and hopefully if it can heal by itself, i have heard that with many people the next time having sex makes them tear again, even though they have been to the doctors many times. Im scared to go see a doctor because i don't want my parents knowing and I find the whole thing embarrassing. The pain isn't that intense however i feel like i have to walk differently and I'm really cautious when i move about and sit down because it causes some pain.