I am writing my second bachelor thesis for a completely different degree and don't know if I should put my name with my already gained title(B.Sc) onto the title page. I live in a country where even bachelor titles are added to the name most of the time, but am not sure if I should/could do that for my other bachelor thesis. The thesis is written in english, if that's important.
The good news is that it doesn't matter. Very few people will read the thesis. If it is normative in your country to add B.Sc after a name, then you have the right to add it wherever you choose. This is not normative in the US or UK, where I have worked. However, there's no requirement that all titles be used, even in formal contexts. In sum: you can choose.