Tinder is bollocks. It is mad. Don't ever go anywhere near it again.
If you need your attractiveness validating, Tinder is rarely the place - it's a simple, very quick mechanism for guys to get a real girl rather than one they have to pay for or imagine.
You have, unfortunately, found out just how crazy it is - you felt obliged to the guy as he'd been 'nice' to you, and so you had sex even though you didn't want to, largely, by the sound of it, because it would have been too embarrassing to say no and because once it started you realised you just had to wait till it was over. OMG you poor thing : ((
He was wrong, but Tinder is also wrong. Basically you led him on before you met him (I don't mean that you meant to exactly, but just by being on Tinder he thought you were up for it), and he understood the deal to be sex with a stranger, because that is mostly what the deal is on Tinder. Maybe you did want to try it - but quickly changed your mind, but sort of couldn't say that.
This is truly horrible, but, and it's a big but: you CAN compartmentalise this as a weird version of a one-night stand, and something you detest but have to block out. You have to write this off, mentally. You have to forget it happened. Pretend it didn't. Focus now on yourself as clean and pure and self-contained and think about all the cool things about yourself, think about your hopes, your friends, the great people who no doubt like you. Make every next moment a new one and you truly yourself and not connected with what happened.
Cut it and move on. It's the only way. Hey it could have been a lot lot worse. You got out of it and you won't go there again because - it's not you.