You're not going to like this reply but check at your local bowling center and see if there is a coach available. At least they will be able to watch you and analyse your game, whereas that will be a bit difficult to do on this forum. The reason I say that is because there could be multiple reasons for your problem, such as, is the ball too heavy for you? Are you dropping your right shoulder too much? Is it a timing issue with your armswing? Are you getting the proper slide for your style? Etc.
If there isnt a coach available, see if one of the more knowledgeable (not always the highest average) bowlers can watch and help you.
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I am the SGT Schultz of bowling.
"I know nothing!"