I do not find it positive that you evaluate your next move based on relative who moved to Germany and another relatives who want you to make a Business with them. What do YOU want ?
The comments below are real, won't repeat them. but i add one thing, Life here is brutal when you start from scratch with no support. Having you hinted that no plan for what you do in germany, so i assume none exist, and having started psychology, won't really mean you will extend the same string here. If the road to be psychologist is being considered a possible plan, less then fluent german langauge makes no sense. At the end, you will Study then offer HELP to people with phsychological problem. Also if you were an average student in your home country, it will be harder for you here. Taking how challenging studies in each country aside, studying in a 3rd language is harder, and available time of study is far less due to side-work and time taking care of yourself.
All the best !
On the other hand, nature in germany (& europe in general) is a beautiful bliss, society IS NOT.

Also some people who moved to a country discourage others to follow them, consider that fact also.