Okay, for a start, I don't think this is the end of the world nutritionally. YOu will struggle with dinner parties though! .
I do think you should see a therapist who can discuss your food issues with you. However, in the meantime, work with what you've got and can do. The texture thing is a very common issue for a lot of people, although you seem to have it more strongly than most.
If you don't mind soup, then that's one easy way right up front to get around some of your issues. At its simplest, most vegetables cooked with stock and pureed will make a totally edible soup. Add a spoonful of plain greek yoghurt or creme fraiche to add some creaminess. If you search on here you'll find dozens of easy recipes but really, finely chop onions and fry in a little oil, then toss in whatever other vegetables you want and cover with stock for approximatel 20 minutes, before pureeing and adding a little milk/cream/yoghurt. I like to add a combination of spices so either cumin/coriander/cinnamon/tumeric with "heartier" soups like butternut or a bit of rosemary and chilli and garlic for lighter ones. I like to add chopped up peppers when I make soup as they add sweetness and they can be pureed at the end. It's also worth adding celery and/or leeks as they add flavour, extra variety etc.
You seem to have a particular texture issue with "squishy" vegetables, so I'd try eating more root vegetables which are less squishy. Butternut - roasting it in chunks is probably best, Potatoes - baking or boiling is easiest, turnips you have covered, any kind of squash - pumpkin, patty pans, courgettes etc cut into fat chunks and roasted will be nice. Remove the seeds on things like courgettes if you find them a bit squishy too. Also, try raw vegetables with things like houmous - eg chunks of carrots, broccoli, celery.
If you think you'd like to add tomatoes, start slow - add chopped tin tomatoes to mince, lamb/beef chunks and cook with herbs/spices for a long time to break down any solid bits of tomato.
Fruit juices are a good alternative to fruit, but be careful as they can be highly concentrated and one glass = a few pieces of fruit. Be careful of added sugar too. If possible, squeeze or liquidize your own or stick to small portions. Also, it's worth trying dried fruit - again, not too much of it but if you have one portion a day, you can get a good variety of flavours if you vary the fruit you eat. Mango, apple, apricot and prunes are all generally good and easy to buy.