Read below for nuance, I'll just sum it up: I think you botched this one.
Indeed, with the last sentence, you made it too dependent on her. Next time, don't ask. State. State your terms. Don't ask the enemy how he wants to surrender. You tell him.
Also, your particular phrasing of the rest of the message sounds accusational.
Never, ever use a person's name anywhere else in a message the way you did. It, and the way it was used in concordance with the rest of the message, made it seem like you're lecturing her for not messaging you for so long a time. It places you above her alright, but in a pedantic fashion. So, not good.
To be honest, if I were her, I'd think you an annoyance right now and not bother anymore. Seriously. Unless I had some genuine interest, but even then it would have struck a mark against you.
An alternative could/should have been:
"Hey Mary,
You're way too late on the advice! I won the lottery and spent half of it on booze, cigs and poker... then I wasted the rest .
Wow, it's been a while since I last heard from you. I was quite surprised when I got your message. Anyway, you've asked me for forgiveness, but... you'll have to make it up to me!
Meet me next week at the school's pub after your classes, where you can buy me a drink ;-). Let me know when I can expect you."
Some notes on this version:
It's harmless and playful. Enthousiastic yet non-needy. It makes you seem happy to hear from her again without throwing yourself at her. There's nothing wrong with sounding a enthousiastic while maintaining a frame on yourself. Of course, that also depends on your mindset. Your own message was a bit... too obviously "I don't care" in that regard. I'm sure you didn't
really wanted to convey that, did you?
Also, note the use of the smilies to strengthen the
perception of humour and innocence. You mean it seriously after all, but in a fun and light manner. Right?
If you get a date in reply to this message, meet set. You can mail her a place of course. If not, don't bother. Anyone no going into this laid-back, non-pressuring proposal was never
really interested in the first place.
Alright. Hope it helps on future attempts. Yours seemed like you took things a bit too seriously (not an indication of your mindset, I hope?). Let us know her response on the one you sent though!
.