It is completely normal for retinol to make your skin feel dry, flaky, and look pink/red during the introductory phase. This is part of the process of adapting to a product that causes increased cell turnover, and can last 2-6 weeks. It is NOT a sign that you are too sensitive to the ingredients or that you cannot tolerate the product.
Many people will stop using the product when they experience these things, or use it only once or twice a week thinking they are doing the right thing by giving their skin a break. However, in most instances, this is not the right thing to do. Here’s why. If your skin is not ‘seeing’ the retinol consistently, then each time you apply it will be like the first time, and you’ll never get through the pink/peely/flaky stage. Instead, pushing through any sensitivity that feels MILD will get you to the other side (the magical side!) much faster. As long as it feels mild, it is part of the process. You should feel confident in knowing that the magic starts to happen soon after this adjustment phase. If it is more than mild, take a night (or two) off of the retinol to moisturize, reassess, and then back to it as soon as you can.
Purging is another normal part of the introductory period of retinol. With increased cell turnover, oil and dead skin cells trapped within pores will be cleared out much quicker than it would have otherwise. Purging manifests as new blemishes that may last a week or so. The treatment for the breakout is the exact ingredients that are causing the breakout. So, stick with it.