I feel uncomfortable
That's because he raped you.
It's not just that you didn't say no - consent has to be 'enthusiastic', not coerced and not assumed. Having sex previously doesn't mean you agree to sex again. Consent is required every time.
I'm a lot older than you. Laws and expectations were very different forty to fifty years ago. We put up with such shit. You don't have to.
Finish the relationship. You don't have to confront him with what he did (to be fair, you did that already) and you don't have to report to the police if you don't want. Convictions for reported rapes in the UK stand at 1.6% (I read that this weekend, not sure where) so the only point in reporting is that it might support some other woman's case and get her taken seriously when he does it again. 'Reported' rapes - probably nowhere near the number of actual rapes. Basically, the UK is a free-for-all for rapists.
So. From now on your life is about you, not him. Finish the relationship, by text. Block him. There used to be Rape Crisis Centres and Rape Crisis lines - don't know if those exist now. If not, see your GP (and don't accept any bullshit from medics who suggest he might just have made a mistake) and tell them you need urgent counselling. It's not unreasonable to want to talk to a stranger rather than family or friends.
I wish you well. So do all of us who have been raped by someone we were in a relationship with. It's demeaning, humiliating, depersonalizing. You are worth something, worthy of respect and love. It might take a while to feel that again, but you're on the right path.