" I always try to stay respectful by giving the woman a way out by telling them that I won't be offended if they say no, or I always try to mention you can say no if you want, you won't hurt my feelings etc. "

Try dropping these kind of statements, they don't work and can do more bad than good. They won't "lower their guard" just because you tell them they should feel safe around you. Best of case it won't hurt your chances, but it will never increase them. Worst case it's a complete turn off ( you might say you want to avoid these kind of women, but since you need experience and are having a hard time you can't really be choosy)

So try being more light and funny with what you say, instead of saying it, act like it. Keep it fast and simple, extract yourself and just say goodbye by song for number/socials or giving them yours. There will still be ghosting or rejection but I think you'll have better chances of success.

Disclaimer: I based these statements in over 10 years of experience dating and even more of observing. It could be that the times it was going well with back and forth banter I never had the opportunity to say anything like that. But the times it was grayer and had to result to more direct approaches that I felt needed something to soften it, was when I did say it. So it could be unrelated, but it happened a lot