I’m going to echo zahavasdad’s sentiments:
Wearing a tallis before marriage is dependent entirely on minhag, with the minhag of the Sephardim (from the Arabic countries) and Yekkes (from Germany) wearing a tallis before marriage, while the rest of Ashkenazim (from Europe) do not. So this particular minhag can be fairly easily discerned if you know you’re (father’s) family lineage.
But this forum is really not the place to ask about practical halacha; we are not Rabbis, and we do not necessarily know what is the correct Halacha. Okiale, you must find an Orthodox Rabbi in your area who can answer your questions, and give you custom-tailored guidance for your particular situation; we cannot do that for you.
But in the meanwhile, I would suggest that you take down the phone number of the Lakewood Bais Horaah (732-905-9992); they have a Rabbi constantly on call to answer practical Halacha questions.