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Sounds like you have video recording set to the default HD720p - or maybe even HD1080p - which means your videos are High Definition and the files are going to be somewhere around 100MB per minute.
You can significantly reduce the file size if you switch to SD480p which is Standard Definition. This quality is not as good as HD, but fine for uploading to t'interweb.
To do this, start the camera, go into video mode, press and hold the screen to get the settings circle up and drag down. You should then get a menu with a Video Quality option. Touch that, then select the bottom, SD480p option.
Alternatively, you could use a video editor (Windows used to include one, I don't know if it's still there or if you can maybe download it from the Microsoft site - alternatively, just google free video editing software) to convert your existing video to a lower resolution.
There may even be apps that can do this - try searching on Play.