@Mariam1
Welcome to the site. Hopefully you are able to find answers that will help you out here. For the issue of Lantus being painful, you may want to take a look at the following discussions:
(As with many discussions, posts go back and forth and often cover multiple topics but I think there is a lot of good relevant information if you read through them.)
https://forum.tudiabetes.org/t/painful-lantus/1992
https://forum.tudiabetes.org/t/tresiba-question/59255/5
https://forum.tudiabetes.org/t/lantus-injection-site/3278
https://forum.tudiabetes.org/t/how-are-you-doing/20763/2