Q.Why Do My Tomato Plants Not Grow Well, And The Tomatoes Look Shriveled Up And Turn Brown To Black.
Squash cucumbers Okra &Peppers,Do well.

Certified GKH Gardening Expert
Blossom End Rot can happen for several reasons, all leading to calcium deficiency. Here is an article that will help:
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm
This article will help you to grow tomatoes to their potential:
https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-tomatoes-guide.htm
This link will take you to a free ebook that you can download on the subject of tomatoes:
https://blog.gardeningknowhow.com/ebooks/essential-guide-to-growing-tomatoes/