Any else find it difficult to invest in a stock that is on a tear?

I was hunting for some companies, found some that looked solid, nothing hype, nothing magical. Rather boring companies, like I got an IoT company that was looking solid. Since buying, it is up 30% in the last 3 months. It feels unreal, 50% in 6 months, and 100% in year. So it looks really good, it keeps going up, but like I don't understand why it is a slow, steady constant growth at such a rate. I would think if they post good numbers, people flock to it, money moves, investors buy up, etc. But then it just keeps going. Now I need to decide to buy another stock that is 50% more expensive than most of what I bought at. Anyone else have that same difficulty? Like buying AMD today for 200/share, when it was 66/share like a year and half ago.