The threads in the oil pan on my car was stripped so i got a bigger size drain plug and it worked but now after i changed the oil again again its not working, its leaking. what do i do to fix it that doesnt envole getting another oil pan.

is the head stripped or threads stripped if head grind down to next size or rectangle for wrench or vice grip if threads better to drop the pan to inspect for filings as well as easier removal of plug

You will have to remove the oil pan & silver
braze on a nut inside, the size of the drain plug, if
you want a permanent fix

There is nothing there to tap out

changing the oil drain plug is actually normal maintenance. they are used and abused so over time they will start to leak. easiest way to know if it was stripped; next time you change your oil take a good look at the threads on the oil pan. are they rounded or kinda sharp? if it was stripped its not a big concern as long as it was re-threaded properly and the correct size and thread type installed afterwards. you cna get all the proper tools too do this your self at your local auto parts store.

Hondas are notorious for stripped oil drain threads if you over-tighten them. Remove the drain plug and take it to an Auto Parts store and have them check the size in mm and then tell them to check the pitch. Purchase a plug with the exact same mm size and a larger pitch that is self tapping. Oil-Tite makes them. Use thread cutting oil and slowly go in and out until the threads are all cut. Clean the threads out and it should not leak. If it does use a fiber gasket and it will seal. If the threads inside the pan are not stripped and the drain plug itself has the stripped threads you can buy a replacement at almost any parts store. Another option is to use just buy a larger drain plug and the use a tap & die to cut new threads in the il pan that match the new drain plug you bought.

If it started after the oil change first you might want to make sure the oil filter and drain plug are tightened / seated properly.

Oil pan replacement is the last option. There are a couple alternatives. Usually, the hole can be re-tapped (new threads cut) and an over-sized plug can be screwed in. This is the preferred method. There are expanding rubber plugs that can be inserted in the hole. These are nice because it doesnt matter how bad the threads are stripped, it will seal. Most auto parts stores have solutions for this type of repair. One thing to pint out - it is not necessary torque these plugs tight. 10 ft-lbs of torque is usually all that is required.

there are thread repair kits made for drain plugs that have the oil pan threads stripped. go to napa auto parts or a jobber that retails to the profesionals and ask them for the kit

I assume you are turning the oil plug clockwise? If you have already fully seated the plug (all the way in), and it is still turning, you have either cross threaded and have stripped the plug threads or oil pan threads.
Take the plug back out and look at the both the plug threads and oil pan threads. Are there shiney small metal shavings or new thread markings? If so you will may need to remove the oil pan and those metal shavings, as those shavings could be detrimental to your engine/parts. You could possibly without removing the oil pan, use a small magnet-inserted into the hole, along with a flashlight and small mirror to check your progress, and retract the shavings out of the pan; but there is a chance of missing some.
Unfortunately, you may have to replace the plug (which I would try first $$ wise) and see if that works. If not attempt to tap the pan hole and try the new plug. If not then you are looking at either tapping out the pan hole to a bigger size and buying a bigger plug OR repacing the oil pan. Someone may have over tightened the plug causing this. It is only suppose to be tightened 15-20 ft lbs.
Let me know if this worked, or if you have additional information of questions. Feel free to contact me on FixYa.com!

You can have the oil pan re-tapped, which mean they can re-thread the oil pan for a slightly over sized oil pan plug. There are different size oil plug and just get one size slightly larger and have a shop re tap the oil pan for the larger oil plug and there you have it, good as new. keep in mind that I would make sure i use lots of grease on the tap tool to ensure i get most of the aluminum filling on the tap and not in the pan. Good luck and this should only cost you 1 hour of the shop rate or you can do it your self if you have to. You can loan out the tap tool from Auto Zone and pick up a larger oil pan plug there too. Be safe friend. 

contact any parts store like NAPA, bring the old plug with u and they can supply a repair plug kit.