We have a couple of young peach trees that I started from seed. They were taken from delicious white-fleshed peaches. To produce fruit identical to those that you've eaten, you will have to find the parent and propagate it by budding, grafting, or rooting cuttings. However, don't cut your peach trees down immediately. Peaches are quick to bear, and there's a high probability that the fruit produced by your seed-grown trees will yield fruit that is pretty tasty.
Tiny peppers form but fall off before they even reach the size of a marble.
Your situation should improve as the weather cools. Night temperatures between 60 and 70 degrees are ideal. Excessive fertilization can also lead to blossom drop. High nutrient levels, particularly of nitrogen, result in excessive vegetative growth at the expense of reproductive growth. Peppers are considered moderate feeders, requiring a small amount of fertilizer at planting and a light side-dressing of fertilizer after the first fruits have set.