First of all, your dick is fine. Good girth. As long as you and she are not obese, you will get good penetration depth depending on the position. Your size would not be a complaint from the vast majority of women. Would they maybe prefer longer? Some wouldnt, some would. Probably even most would. But it would be a case of making a good thing better, is all. Nobody is perfect, and every single thing can always be better- that’s simple fact

Does the above help ease your mind? Probably not, although it is all true. You are left with two options at this point. Seek therapy, and learn to come to terms with your insecurity.

Or, the fun way- get laid, pal. Have sex with someone you trust and care for. Learn each others bodies, learn how to please her (tip: learn, by asking what she likes), and remember that it’s a journey. You won’t be a superstar the first time, or the tenth. But eventually you will. and through your success you will realize that your size is perfectly adequate, and all of this drama was time you could’ve better spent in bed.

(One last tip: give “she comes first” a read. Satisfy her with your tongue and you’ll lessen the pressure for intercourse)