You have decided to change and work on yourself.

Excellent!

But there will be consequences. People you hang out (aka friends) will see you change. They will not be used to new you (or for time being changing you). It will be strange. People tend to resist changes. So will you friends. They will tell you that you have changed and they don't like it. You will suddenly be interested in different things. Things they have no interest of. Things you were not interested in (so much) before the change (music, clothes, psychology, partying, girls,...). Some friendships will suffer. You can try to work them out but don't let it stop you.

That is the consequence of change.

But those closest to you will understand and will support you. That is why they are your best friends and family. Listen what they have to say. Ignore those who resist the change. Change is outside your comfort zone.