I´d like to have customers registrations

i´d like to have customers that register to my service and then when they log in their personal information is shown and they have access to previous forms they had summited.

is it possible with jotforms forms?

You can create Autoresponder email inside of your form. Autoresponder email will be sent to your users once they submit the form and it can contain all data that they have entered inside of the form. 

Setting Up an Autoresponder Email

You can also add PDF report, that will contain submitted data, to Autoresponder email. 

If you want to allow your users to edit their submissions, you can add edit link inside of Autoresponder email. 

How to Let Users Update Their Form Submissions at a Later Date

You can also create reports of your form submissions and share it with your users. For example you can create Excel report - How to Create an Excel Report?

Or each of your users can create JotForm account and you can add them as sub account user of your account and share the forms, submissions or both, with their account. 

How to Share Forms with a Sub-account User

Hope this will help. Let us know if you need further assistance.