You have to tell your girl how you feel, even if you think you are showing it every day. You just need to say it because you will not die after telling it. If you think that it would make you weak in her sight, I am sure you got it wrong; she will appreciate you more than you can imagine.
If you don’t tell her now, she will find some other guy that will say everything she needed to hear from you. So don’t be sorry, don’t blame her but yourself.
Don’t lose out on a love by not saying I LOVE YOU. Go and tell her now.