Firstly, be reassured that the point you make about being able to orgasm by clitoral stimulation but not vaginally is really common. It’s mainly because the walls of your vagina have far fewer nerve endings than in your clitoris.
Your gynecologist was right about the fact that showing wetness suggests everything is working. The best you can really do is to try to get that tingling sensation from using the parts of your body that do respond, through experimentation and sexy play.
Have you tried a vibrator to see whether that arouses you - you can play around with different types, sizes, rhythms and speeds, and this might give you some indication of what gives you the best chance of arousal.
Have you tried lube that has a tingling sensation? Condoms with ribbed effects? I know, if you’re in a long-term relationship you might not be using condoms, but explain to your partner that it’s just to mix it up a bit and to explore different textures and feelings.
Positions, too - have you explored positions that might give you more friction and put pressure on different parts of your vaginal walls? Some women who struggle to climax vaginally find that rear entry is their best bet - but you’ll still need to experiment with speed and rhythm.
It’s going to take a really understanding partner, but what man is going to complain at a bit of experimentation? Don’t’ be shy.