Definitely a myrtle. Have viewed myrtle online and 1 variety is exactly the same. Strange why it is just flowering now, probably the unusually warm weather.
I have similar myrtle, which has reached the proportions of a small tree. I have started to prune it back quite hard after flowering to try to get it under control. Is this the best time, usually in August? I am terrified that if I prune it in the spring I will end up with a huge tree.
Don't worry about pruning an evergreen plant when it is overgrown. You did what you needed to do. As long as you leave any further pruning till next year in early spring. The shrub will be fine. You may lose some of the flowers, but I think Myrtles are valued for their leaves and form over flowers, since they are unreliable with flowering unless the summer has been exceptionally hot for long periods.
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Sprigs are used in most Royal Wedding bouquets.