For example, the pressure between two people comes from the gap between them. You feel that you are far from each other, so there will be a lot of pressure in front of him. Then you can only adjust your mentality, or keep learning and improving yourself, be a hard worker and narrow the gap between you, so that your pressure will gradually decrease.
If your boyfriend is a particularly clingy person, he has a strong desire for control and always takes care of you, so getting along with you will make you feel stressed, then you can have a deep communication with him and tell him that you should have mutual trust and your own space, so that this distance can produce beauty and make each other comfortable. It is really unacceptable to tie each other to their belts. When he realizes that there should be a certain distance between you, your pressure will be relieved.
Another pressure comes from urging marriage. For example, if you don't want to get married, and the other party always wants you to marry him as soon as possible, you may have some pressure in this state, so you should give the other party a deadline and tell him that you have no plans to get married before then. If he can accept it, then continue to associate.
To sum up, there must be a source of stress. Find the source of your stress and solve it.