Yes, it absolutely gets easier.
Like you, i was an LP from the start. The night feeds were the worst. The monotony of the day times a close second. But after those baby years and toddler years, from about 3+ things became amazing! DD is 5 now and i love her to pieces. She is happy, intelligent, asks questions about her absent father (which i answer honestly, such as his name, age etc and when she asks why she doesn't have a dad, i just say that he doesn't want to be one, which she accepts.)
I had a very supportive family, which did help. My mum would take dd on a Sat afternoon for me. But i still felt myself sliding into a depression, and yes for a while i did resent parenthood. And i did feel sorry for myself. So i began college and work Mon-Thurs 9-5, and my mum minded dd for me.
This was a perfect balance for me. I realise now that i just was not cut out to be a SAHM, and i needed some sort of release, which i found by working and studying.
It's important that you don't put too much pressure on yourself. Don't feel guilty for wanting to 'escape'. If you realise that being a SAHM isn't for you either, don't feel guilty about putting your ds into the care of a relative or professional setting so you can work/study. (this is assuming you don't do this currently, sorry).
Just take each day at a time. Try and get out the house every day. Join groups. Socialise. it's so easy to sink into your own life and quickly lose self confidence when you're an LP and SAHM, as you don't engage with other adults that often (at least this is what i found). So make yourself talk to another adult at least once a day. texting doesn't count. Even if it's just 'hello' passing someone in the street.
I also found planning my days, writing hourly schedules helped me in the baby years. Otherwise the days just dragged by.
And as difficult as it might be, try and savor these early years. I spent such a long time wishing my dd's away, as i found them so lonely, that i really can't remember them now. 