They asked me the exact same question, and I'm afraid you're not going to like the answers. I'm so sorry and this is likely to be triggering, but you need to know the whole story.
Firstly, whilst it is possible to freeze your eggs, you'd need to go on high doses of female hormones for a couple of months so that they can mature a whole bunch of eggs at once and harvest them.
Secondly, egg harvesting & storage is not covered on the NHS, and when I looked into it a couple of months ago the costs were something like £2,000 to have it done in a local hospital.
Finally, they said the eggs are only usable for about 4 years after harvesting because they contain a lot of water so they deteriorate quite badly if they're frozen. So if you didn't find a partner & start a family in that time, they'd be completely wasted. The best way to store your genetic material long-term would be to have your eggs harvested and fertilised now, because they can store embryos for much longer than unfertilised eggs.
I had to go through a grieving process because I've always wanted another child, but going on T and transitioning is much more important to me.
Another option is to have some ovarian tissue removed and preserved, but that too is hellaciously expensive and not covered on the NHS. Alternatively, when the time comes you could ask a male relative (such as a brother) whether he'd be willing to donate sperm to fertilise your partner via IVF, so your kids would bear some relation to you.