My Vagina Hurts when I try to stick a finger in

I’ve never been able to locate my vagina, regardless of how many videos I saw. I know where it would be located but I was never able to find it. I guess being fat complicates it a bit(lol). I was laying in bed and i decided to go for it, I turned on some porn but I couldn’t really get horny. I guess I’m too stressed about finding it. AND IM SO HAPPY BECAUSE I FOUND IT!! I inserted a finger (well not exactly only the tip, and it hurt really bad). So I took it off and tried again and I couldn’t it just hurt way too much. I’m a virgin, 18, only ever masturbate with clit. Do you girls and/or people with vaginas have any tips? It kind of burns a bit now, nothing crazy, I went to the restroom and a tiny bit of blood came out