Info:

I'm 18M, recently lost my virginity and i have 2 FWB relationships now (plates).

In total, i've had sex 3 times and it's going to be a lot more next week.

My first time, i didn't expect a lot. I thought i would cum in 10 seconds. I ended up hard-fucking 30 minutes straight without feeling anything, the last 5 minutes i started to feel something and finished with an orgasm that didn't even feel that good. For the first 20 minutes, i couldn't even feel my dick being hard inside. (it was though). Eventually i went to check on my penis, and after pulling out it went semi-hard immediately. I kept losing my erection after that a couple times.

Note: she was wet as hell, after some googling that could have been a factor.

Now since i didn't feel anything, you might think my penis is too small to hit her walls. It's not even small; ~about 6.3 by 4.9 inch, which, in the Netherlands, is average and she was not a big girl. I also use the XL durex condoms, which are 57mm in width, so that could not have been a factor.

First time, kinda bad, so i went on no fap for 4 days and fucked a different girl. Again really wet and this one did give me a blowjob. I thought that the no foreplay of my first girl made a difference. Couldn't feel a thing during 2 minutes of the bj and then finished with an orgasm that felt 10 times worse than masturbation. After that, i got it hard after 10 minutes and started fucking her. Didn't feel a thing and lost my erection after like 10 minutes. Couldn't get it full hard after.

I am circumsized, and my head is almost completely insensitive, it's the shaft that feels the best. This for sure is playing a factor.

What can i do to get more pleasure from sex? I am going to combine both, getting a bj for like 1 minute and then fucking her. That will work for sure. But why do i keep losing my erection? And why do i feel almost no pleasure from this?

TLDR: didn't feel anything during my first 3 sex experiences until the last minutes and keep losing my erection after a while all the time. What can i do to make sex more pleasureable for myself, which is also better for the girl?