@jevoudrais DO IT! Anyone who loves you and cares about you will be fine with you doing this. To hell with 'tradition,' times move on. You do what YOU want, and what YOU are comfortable with. Your family will thank you later, trust me!
Obviously tell your family, but yeah just do it. It's incredibly selfish for anyone to tell you not to do it. How you want to go after you die, is entirely YOUR DECISION. Do NOT be bullied into not going for a Direct Cremation if this is something you want.
It's 100% OK! Me and DH already have our 'Direct Cremations' planned and sorted. We are both in our late 50s, and we did it late last year, our adult DC know, and they are very happy with it... Why would they not be, if we are? 
I know several others who have this type of funeral planned too. I also know a woman whose dad died last summer, and I asked her when the funeral was, and she said he had a direct cremation.
She said it was a brilliant idea. No-one had to have the stress and worry and faff of arranging the funeral, and shoulder the costs of it.
Everyone who was close to him and loved him met up at the pub the Saturday after his cremation, and raised a glass to him, and shared their fond and funny stories of him.
Also, a direct cremation stops fake mourners turning up, pretending they give a shit about you. People who don't know you, and people who have had fuck-all to do with you for for 15 years or more, can't just rock up to the funeral and pretend they're mourning, or that they care about you, because there's no funeral!
Only the people close to the deceased will know anything about any get-together afterwards.