Zara, it is a tough journey we have all been on to be here. Don't bash yourself up about feeling down - it is OK and perfectly normal.
Sounds like you might want to stop looking at Donor Profiles etc at the moment and spend some time getting your head really around the end of TTC with your own eggs. If you try to do it while you are still thinking 'not fair' etc it will be much tougher and your odds of success will probably be lower (IMO anyway).
Is there a counseller you can talk to ? Whether via work or outside ? It might help and certainly can't hurt.
Re adjusting to the idea that a child won't look like you .... well I am going to be rather direct and say there is no guarantee a child from your own eggs will look like you ! I have loads of friends who look nothing like their OE children and everything like their partners family and some look like they were found on the doorstep ! Having said that ... don't forget, genetics are only a component of how a 'child looks' - so much of what connects a child to a parent are mannerisms and speech patterns and ALSO don't forget epigenetics will mean that any DE child will likely pick up some of your characteristics simply because your body is 'growing' it.
But when the time comes... if you are bothered by the idea a child might look totally out of place in your family, make sure you focus on the controllable aspects such as hair/eye colour and height/weight. It may mean it takes longer to find a donor but if it is important to you then you shouldn't dismiss it.
I don't know if it helps you but a couple of 'stories' from me re the issues:
1) As I said, for me, looks aren't such an issue, however, during a previous cycle I had to change my egg donor late in the peace and realised that both my egg and sperm donors were over 6 foot 4 and I & my family are all around 5 foot 7. I thought, I couldn't have a child that was a foot taller than everyone else, so changed my sperm donor to try to mitigate that height possibilty and I was suprised how strongly I felt about making that change and also how quick I did it.
2) I would have been quite happy to adopt a baby but in Aus for a single female that is impossible so I am on this road and am (hopefully) going to experience the wonders of pregnancy and birth, but I just look at the embryos that are growing in me right now as the earliest form of adoption possible ! That has always seemed to me to make it easy to accept a baby won't bear my DNA and I look at my physical faults an think 'lucky them !' in avoiding my dodgy feet, big butt etc
Good luck and be kind to yourself.