Mentally ready to loose weight help!!!

I am 42 and ashamed to say I'm 305 lbs heaviest I've ever been. When I was younger my father always dieted with me which was a huge help but he passed suddenly in 2009 and ever since then I've had a tough time getting motivated to loose weight even with help from other people. Trying to find a way to break through this mental barrier so I can become healthier and looking better for myself and the ladies lol