What to do if i may have thanatophobia.?

Fear of death/dying: This can be a simple or complex phobia - it can have religious or other (i.e., medical) aspects. Depending on the specifics you might choose different resources, but counseling and support are often helpful. Finding someone you trust and respect to talk about it with - groups of similar minded people - writing and reading - even courses in colleges can help clarify and desensitize folk. It's okay.