Two weeks ago I met a girl in the club, we hit it off really well, got her number on the night and we danced and made out a lot. She was recently out of a relationship and her ex was in the club, so admittedly I was a bit jealous when she had to go talk to him because he started crying to her or some shit like that. I decided to text her the next day because I didn't really believe in the waiting game, we arranged a date for the Sunday of the week after. And so I didn't text her for 2 days, she ended texting me on the Monday, and she seemed reaallly keen, we exchanged snapchats and ended up having a little conversation on sc throughout the evening. On Wednesday she wanted me to come over, so I did in the end because Sunday was still a couple days away. She said she didn't want anything serious, with which I'm fine as long as I get laid. She didn't wanna fuck at first because we didn't really even know each other for a week, but we ended up fucking anyways, that was my first time having sex. At first it was great, she didn't really like guys going down on her so we skipped half the foreplay, she was already really wet though when it came to the deed. I have to say that I didn't get to finish, because it was really late, and she didn't want her parents to get suspicious over the fact that I was staying over late. I tried my best and it seemed like she was really loving it (Hard breathing, grabbing the sheets etc) except I think that she got offended at me because I didn't really look like I was enjoying it, even though I was, like come on I was getting laid.

Then she came over on Sunday of that week, and I saw a bit less action, we didn't have sex because that time of the month, but I she didn't really seem as keen as she was on Wednesday night. I drove her home and ended up kissing in the car, so she didn't really seem disinterested at that point. She invited me round her house again this Sunday, where she said she doesn't want to get into a sexual relationship at the moment because she needs to 'focus on other things', she just wants someone to hang out with at the moment, so I thought I might as well make a friend batting for the other team, she might come in useful later on. I asked her if that had anything to do with me, and she said it didn't- She just feels like it's too soon since her last serious relationship, but some reason I am still convinced that she doesn't want anything from me because I might've been bad at sex that one time.

I'm just looking for advice to see if she's just making an excuse, or if it's generally none of my fault, I'm willing to answer questions if you need to know more, because this is kind of eating away at my self-esteem.