There's an unavoidable amount of guilt. I should be remembering them more, I should be honouring them by keeping them in my thoughts, but I can't think about them 24/7 and now I feel guilty that I'm doing them a disservice. The callous answer is life goes on and you need to go on with it. The friendlier answer is you have to give yourself permission to live for yourself, thinking about them only some of the time is still keeping their memory alive. It can help to have a representation, be it a specific day like their birthday you assign to their memory or a physical item. I lost a parent when I was a teenager, it turned my world upside down, I found what helped was having a thing as dedication to them. It let me compartmentalise the emotion to that object and gave me permission to not think about them all the time because they're being remembered by that item existing. It's not easy but does get easier, ultimately just be kind to yourself. It's not a quick process.