Nothing to be embarressed about, talking about penises is what this place is about.
And for your size, 5 inches is on the smaller side of average. Some girls care about it, and some do not. They are generally more interested in girth though, and if you are a jerk they won’t care how big your penis is (except for the size queens who HAVE to have a huge penis).
If you feel bad about your size, your in the right place. If you stay committed, believe it will work (it seems to help somehow), and do some reading you can increase your size. You need to do PE for yourself though, not for others. It’s your hands that need to stretch and jelq your penis to make it bigger.
For this topic, there is lots and lots of topics about it. Do some searching and reading. There is no easy answer, you just got to read all you can and make up your own mind.