Being around positive influences and watching someone who leads by example is a great way to learn how to have a good relationship for yourself. If you are in public and think you need to argue, at least find a quiet corner or separate room where you can discuss whatever it is bothering you. There are going to be differences in opinion, and probably some disagreements.
As long as you do not expect them to read your mind and accept that this is a part of getting to know one another and communicating, you will be fine.
Choose costumes the two of you can wear to enhance each other. You are miserable and eventually, the person is going to be exposed to the real you. There are yearbooks, maybe love letters from a first love, other objects that may not seem important to one person but to the owner, they have a special meaning.
This will take some time and planning but very little money.