There are a couple linear scratches which seem to be due to scraping of the skin with your razor. There are also a number of small circular eroded areas 1 mm or so in diameter, which have a follicular pattern, that is, they follow a pattern of hair follicles. Towards the lower part of your neck, you have an intact pustule, you can see the white head of it, if you magnify the picture. So part of this appears to be technique, ie the scratches, but also part is folliculitis, induced by shaving. Pseudofolliculitis usually has more of a bumpy and less inflamed quality, but if you are shaving off the bumps completely each time you shave, it could give this appearance.
Its quite possible you might not be able to shave with a straight razor, have you tried using an electric for a short time and does this solve the problem? If you really want to continue straight razor shaving, here are a couple things to try.
1) bacteria can worsen folliculitis, so using an anti-bacterial wash such as benzoyl peroxide 5% once a day might help. Keep in mind you should do it at the opposite time of day that you shave, ie if you shave at night wash in morning, because the benzoyl peroxide, even though you wash it off, can be irritating on freshly shaven skin.
2) hydrocortisone 1% ointment you can get over the counter, and you can try applying that twice a day. This will calm down the irritation, and the ointment will provide a nice gentle way to replace lost oils on the skin which may be exacerbating the folliculitis. Also follicultis can cause itching so the hydrocortisone will help that too.
3) try shaving extra gently on your neck and try to get away with as little ATG action as possible.
Good luck and let us know how it goes!
Pete