I have a lot of blossoms on my cantelope but no fruit is being produced. What is wrong?

One reason why you have a lot of blossoms on your cantelope [sic] but no fruit is being produced could be b/c the male flowers develop first then ... about a week later ... the female flowers appear. Might could be expecting too much too soon.

Another reason could be b/c you applied a pesticide and killed your pollinators.

One more explanation could be daily high temperatures have degraded the pollen.

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Best advice is sit back ... relax ... let nature run its course.

You'd likely make matters worse by interfering.

On melon vines and related plants, usually you will have only male flowers for a while before the female flowers show up. The female flowers are the ones that produce fruit (the male flowers produce pollen to fertilize the female flowers). You can recognize female flowers because each one has a baby fruit at its base,

Nothing. The blossoms come first, then the fruits grow from the blossoms. Look closely; aren't there any tiny green things?

No bees or other pollinators are getting into the flowers.

Either learn to hand-pollinate

or have someone put a beehive nearby for a while.

You have an unclear understanding of plant growth: flowering and fruiting.