I started very slow and as soon as I was holding QSOs my speed picked up. I am no speed demon but my CW has improved quite a bit by being on the air. Go for it. If people don't slow down to reply to you after you tell them PSE QRS, then just spin the dial to another frequency and call CQ CQ agn. You will find 99% of the operators who will match your speed. Besides no one knows you since you will never see the people you hold QSOs with unless you become friends and meet at HAM Fests, etc.
I find the following freq is great for new folks including me: 7.055. From about 7.049 to 7.060 I have held many QSOs on 40 meters. People sending only 1 Watt up to 100 Watts. Have not made any DX contacts yet but sure met a lot of nice people on the air in the US.
You have nothing to lose and everything to gain.