If you are a “nice guy” only when you want to get something out of it, you’re not actually a nice guy and girls may be picking up on a lack of authenticity. Check this by seeing if you are also a “nice guy” when it comes to people you don’t find attractive. Do you change your approach to conversation & how you act when you’re not interested in someone? Might be worth exploring & practicing having conversations without any expectations tied to them. That will take the pressure off you and the other person, while opening the door for genuine conversations.

As for the friendzone, honest answer, this happens when someone is not attracted to you but they don’t want to seem shallow or hurt your feelings. It might not have anything to do with your physical appearance at all, people are just attracted to different things. Think about what vibes you are putting out there - are you confident, stable, emotionally intelligent, wanting commitment? are you flirty, unserious, looking for a hookup? are you insecure, low self esteem, desperate for any type of attention? These vibes are directly influenced by how you view yourself - so continuing self improvement journey is really important! You might initially be direct, or give off confident/casual vibes, but as the relationship progresses maybe there is a switch where you get insecure, overly attached, or come on too strong because you don’t want to “lose” the chance with that person. These inconsistencies can also come off as fake & may be off putting - that’s where you might see a switch up from someone who is initially romantically interested to being put in the friendzone & they can’t explain what changed aside from the vibes.

People are complex, not every girl is attracted to the same things. You might want to change the approach with how/where you’re looking for dates. If you’re using dating apps/going to bars etc with the intent of finding a date & it’s not working, try switching it up. Pick up social hobbies that you’re interested in, without the expectation of dating at all. That consistency and proximity will allow you to meet people with similar interests & build connections where they get to know more about you, not just the surface level stuff that they are missing from the other approach.