Each child has his own attitude to the appearance of a new man in the family. Violent interference in these matters by one of the adults can negatively affect the relationship. However, mothers still often force their children to call their stepfathers dads.
Many children, especially if their father played (or is playing) a significant role for them, perceive their stepfather extremely negatively and interpret his actions accordingly. Let go of these prejudices and try to take a fresh look at the state of affairs. Maybe he will not replace your father, but what prevents you from being great friends?
Determine your attitude towards the new person. In this case, there is no need to exaggerate: take it as it really is. Do not attribute all negative actions to him, but you should not add angel wings either. Do you like his manner of communication, outlook on life, behavior. Would you like to see such a person as a father?
Contacts with stepfather
If you understand that you are ready to exist normally with this person, then maybe the word "dad" will be appropriate. To build a really good relationship, his behavior alone will not be enough. It is important that you also take steps: ask for help and help yourself. If you are not yet ready for such actions, start at least just better to take a closer look at this person.
Try talking to your stepfather. Better to do this in private, when no one else is at home. Ask if he wants you to call him "dad" or if he doesn't like it either. There are also such men. Maybe he will tell you that he always dreamed of such a son or such a daughter as you, and for him it would be the greatest joy. Try to find a common language with him and maybe he really will be worthy of being called a dad.
Contacts with other people
In relation to the mother, too, everything is not very simple. If the demands are unfounded (for example, if she just wants to please her new husband), they are unlikely to be decisive. But if the mother really sees your father in the new man, why don't you just please her? In the end, no one forces you to change your attitude towards this person or forget your old father, but for the sake of a smile for your mother, you can just say this word without investing any important meaning in it.
You can also discuss this problem with friends or yourself (for example, using a diary). If you keep the problem to yourself, sooner or later it will break out. It is advisable to discuss it with someone who is not directly related to her. This will help you determine your own thoughts, desires and motives. Don't give up on the new person in your family, but remember that you don't have to accept them completely. However, try to do your best.
Alternative options
It is not always possible to immediately call a person "dad". In this case, you can use alternative options. For example, use a bundle with the name: "daddy Lesha" or "daddy Sergei". It's much easier. Perhaps soon you will start cutting off the other half and start just calling your stepfather father.
If you have no desire to apply the word to a new person, talk frankly with your mother. Say that you cannot change that much now, but that you will make an effort. You shouldn't lash out at your mother, raise your tone, or completely ignore her words. Try to say exactly what will allow her to understand you as correctly as possible.