My FS explained that they have to answer to an ethical board about all cases, and so they have to make sure that if they have to justify why they treated someone that they can say "well, look, we did this and this and this to make sure that this person was ready and had the support". It's their reputation and practices on the line. I don't think it discrimination, just legally and ethically they have to be 110% sure about it...
I know it seems silly, and I think in a way it is because if you've made the decision to do it through a clinic then thats really showing a certain maturity I think to do it 'properly' instead of just randomly choosing some guy and using his sperm...
But anyway, its not really an issue as your dad is supporting you? So its not really in jepardy, just a bit delayed?