Downswings

How long do [censored] downswings usually last? Is it normal to be losing the vast majority of all ins when you're a favorite for a month or more at a time? 65/35 and 70/30 edges are meaningless to me. Because my stomach drops whenever I see that I'm favored like that. It's a sure loser.

Seriously, any notion of how long downswings can last would help me out. I'm on the verge of quitting the game because I don't know if I'm a good player anymore.

I know my sample size isn't big enough but I built my bankroll from $100 to $2000 through SNGs and last month's ITM% was 45%. I have finished ITM in 3 of my last 25 SNGs. Since I haven't changed my play, is this a cold run or do I need to question whether or not I should even play this game?