Hi Carapepi77 welcome and god luck.
I am not gay but I am an adopter.
Don't worry too much about all this, being adopted will not stop you adopting and all you need to explain is why you want to be a parent and why this route feels right for you, IMHO.
However, the social worker will want to see you've worked through any 'issues' related to your own adoption to ensure that when a child is placed you will not have concerns etc or issues related to your own adoption which you will need to resolve while the child is in your care.
I was almost 50 when we adopted and had had a lot of fertility treatment, it is costly, especially if you need to use a donor (we tried with donor eggs due to my age), we have a birth dd and knew what our fertility issues were and had come to the end of energy and money for fertility treatment. Adoption was totally right for us, it was not second best and has been a really great thing for our family. But, for whatever reason, I did want to try fertility treatment first.
Not everyone wants to go for fertility treatment, social workers should be able to understand that.
However, IMHO, another thing the social workers will want to know is that you have 'come to terms' with not having your own biological or genetic child. This is, again, to ensure these things do not raise issues for you once your child is placed.
Everything done is about ensuring the match and placement will 'work', the child will integrate into your family and have a happy and peaceful life after a difficult start.
So try and see the whole process about being able to ensure you will be able to parent well and not to do with anything else.
There have been a number of lesbian adopters on here, single and in couples - and hopefully some may be able to come and say more about the process. Those I've heard speaking about it here seem to have felt they were treated very fairly and well.
The only gay male couple I know in real life have now adopted two quite young children and seem to have done well, so hopefully all will be well for you two.
Good luck.