If this is the attitude you show, it will not change.
You are who you are. You can’t get taller and your dick won’t start growing again.
You can’t be gay because you think you are unable to give sexual pleasure tot a woman. You are gay because you feel attracted to a guy, not only to his penis. Or, you are straight because you like women.
The size of your penis can be of importance when giving a woman sexual satisfaction, but most important is how you treat her. Not every women likes big dicks.
Besides, your penis is not small.

If your attitude is: I’m small build, I have a small cock and no-one notices me, than no-one will see you as an attractive person.

You have to change that attitude. You look good in every way. You have to give a lot of love. Open your mind for that!
With some effort you will succeed. Repress those negative thoughts!