Better late than never!
Don’t ever think of yourself as useless. You have no idea what you mean to others. You may very well be the reason someone gets out of bed in the morning. Even if you think you do nothing, sometimes your mere presence is enough to give someone else a purpose.
On the flip side of that, don’t ever take the presence of someone for granted. Every single day is a gift, and one of you isn’t going to be around forever. Always assume it’s the other person and make every moment with them as special as you can.
Accept that you won’t be perfect at this. Accept that if every moment was special, no moment would be, so sometimes it is good enough to just sit around and bask in the presence of each other.
I could bask all day in the presence of that woman…