(I’m not sure if this belongs here) I’m scared of my first time… because of reasons… [M]

Hello,
As you may have read, I’m kinda scared about my first time. It came up about half a year ago while masturbating, as I noticed I’m… finishing way too fast. And I mean really fast.
Last night, I had a chat about sex and stuff with my best friend and brought up this problem a bit. She said for her, and probably most other woman, it’s actually completely ok to not last long, since she experienced the same at her first time and that I shouldn’t get fooled by porn. She said I should just be relaxed when the times comes, it it probably comes pretty soon, and then it’ll be ok.
But it still makes me uncomfortable. I haven’t talked to my girlfriend about it either.

So is there anything I could do about it?
And what are your views on finishing early?