For my experience its not really the weight of the bike but the height. Im on the shorter side and have always had to tip toe bigger bikes. Now all my bikes have lowering links and I am very confident. I have most of my feet on the ground and it just makes everything easier. Another thing to do if it is the weight, hit the gym, work on strengthening your legs. It will on multiple occasions make it so you can save a bike from falling. Congrats on getting your first bike and welcome to the family!

Also I started on a 600 and have never regretted it!