@rachelg09 Which clitoral suction toy did you get? Each one probably has it’s own peculiarities 
The only one I’ve used is my womanizer premium, and some of the things mentioned above helped me get used to it (switching from the small to medium head, figuring out the best placement, using lube to help the seal). It may take a few sessions to get used to the toy and to get used to the different kind of sensation suction toys give…
This thread has a bunch of tips and advice about suction toys (the title says womanizer, but other brands are commented on as well 
)