Literally you are out of status if you havent notified your DSO about where you woking or volunteering related to your major. You should notify in written within 3 months after your OPT start date or should a have gone to school if you could not find job within that 3 months. However, I dont think USCIS will keep track of the OPT students about where they working related to their majors or not because they have lot of other sh*t to take care of. BUT!!! Just to be on safe side, I urge you to get I-20 ASAP. You never know when you get knock at your door or get surprise letter in the mailbox. By law you should be either working in the field related to your major and notify the DSO about it or you should be gone home/school by now.