Hahahaha had this experience with my 1st bf.
I think I was not his first but he was mine.
It was good the first few months and I thought our sex was hot although most of the time I really don't enjoy it and thinks its normal cuz can't compare yet.
Then we had a fall out and met a new BF which made me experience real sex and made me realize my 1st was just totally enjoying himself without thinking about my pleasure.
When the 2nd one and I broke-up the 1st one came back and we lasted 2 years before I call it quits because he still sucked at sex even though I tried to talk him out of it and sometimes take the lead.
Maybe I was just really sexually frustrated that even though I love him he just thinks of himself at bed and doesn't care about me.
Wow looks like everyone is having sex..
While here i am just reading manga..
And im already 24...............
well technically not "everyone" since just as you said you're just reading manga. ╮(╯▽╰)╭
Well, this is so fucking true. Most women don't get an orgasm just from penetration. We kinda need other ways of stimulation aside from that to cum. This is why its best to have an honest and open talk with your partner.