i forgot my security question & its answers. i don't have reset e-mail address also. pls help.

Details?? How do you expect anyone to help you when you haven't really said anything at all? Although, if you forgot your security question and answers and you don't have reset email - (is that even possible?) I think your kinda SOL. I don't think that there is much you can do other than start remembering the answers to those questions.

you likely has to show up at an apple store with proof of purchase

Just a heads up, the Apple Retail Store is not equipped to assist you with much more regarding your account outside of what you have already done. They can assist with removing Activation Lock (Find My iPhone Activation Lock - Apple Support) if the problem revolves around removing an account from your phone so you can use the iPhone itself, but that's about it. To do that, they will need the proof of purchase that was mention by the previous poster.

If you need further assistance specific to account access, as it sounds you do, you will need to contact AppleCare by phone, and ask to speak with Account Security.

Contact Apple for support and service - Apple Support