HELP: A Confusing MDMA Experience

So this was my first time taking MDMA. Before I take or experiment with any drug whatsoever I always ensure that I have gone through thorough amounts of reading and research on the substance before I actually do take it. Judging by the way the MDMA looked and smelt in the capsule that it came in I was fairly certain that it was pure MDMA. The substance was not tested so I was not 100% sure.
I was planning to take this substance for the first time for a friends 18th party. I ended up ingesting the substance at around 8:30. I was aware of the effects that were expected to take place. throughout the first 30 to 45 minutes of the experience I felt quite tired and restful as if I could easily go to bed at that moment, I read that this was very normal and was expected to occur on the come up after ingesting MDMA.
However this same feeling was all that I felt for the rest of the night, music definitely sounded a lot better than normal and I was definitely having some altered visual experiences such as the floor warping if I look at it and focus on it. A significant moment was when I unlocked my iPhone and the apps started to sort of zoom in and out in front of me. The experience almost felt like a mushroom trip except my mental state was how it normally is but there was a heavy body high which made me feel good sort of like I smoked weed although I did not consume any after much later hours into the night. In general the experience was nice, however it was not what I was looking for due to the specific occasion. I was expecting to experience effects such as being really social and having energetic urges to move around and interact with everyone around me. The experience ended being quite the opposite though.It was actually fairly hard to have a conversation with people.
Can anyone tell me why this happened I weigh around 73kg (161lbs) and I am fairly confident that the capsule held 100-120mg of MDMA in it.