Hi durgadas9645,
The tricky thing with a question like this is that there's no one, universal thing that every woman (or every person of any gender) enjoys during sex. The way to really know what a partner finds pleasurable is to ask them. If that feels daunting, we can certainly talk about how to approach that kind of conversation.
As for your concerns about your penis size, I think you'll find this article helpful when it comes to getting a clearer picture of how much size actually matters:
Shown Actual Size: A Penis Shape & Size Lowdown