Sir my erect penis length is 10.5 cm is it okay?

You're fine, man: This is shorter than most of the guys you'll see online, but it's big enough to do the job. A shorter penis gets harder and you have better control stimulating your partner's best nerve endings which are toward the front. A bigger guy is likely to run into incompatibility issues. Cherish being a man and learn to use your mouth, hands, personality, and everything else to be a great lover.