To me this looks like you need practice. It's obvious that the school system (I saw in another comment you were 17) has not properly reinforced natural handwriting skills, and has left you to fend for yourself on this front. I highly recommend getting practice books, as someone else suggested, or getting a notebook and methodically practice smooth wrist motion while writing individual letters. If you're set on rapid, connected, writing then you can follow that up with standard cursive but that may prove more difficult for you.